Marks Daily Apple
Serving up health and fitness insights (daily, of course) with a side of irreverence.
6 Nov

Boxers or Briefs?

Boxers or Briefs?Believe it or not, it’s a question I get fairly often: “Grok didn’t wear tighty-whities. Should I?”

From time to time, I like to have some fun and expand the scope of this blog beyond the regular topics. Health and wellness, after all, come down to far more than just diet and exercise (and sleep and sun and stress, for that matter). So I’ve written about everything from the benefits of squat toiletsgoing poo-less, and stand-up workstations to the dangers of excessive sitting, nighttime light exposure, and passive living. Today, I’m going to branch out again. Today, I’ll attempt to answer what sages, wise men, gurus, and guys sitting around in gym locker rooms could not: boxers or briefs (or nothing at all)? So fill your cup and let’s dig in.

This topic was prompted by a reader’s email:

I thought this could be an entertaining topic.

We’ve all seen the Seinfeld episode where Kramer starts wearing boxers when Elaine tells him boxers are better for his sperm count.

Is there any hormonal drawbacks associated with briefs that could be caused by the low sperm count or vice versa?

Our ancestors were certainly “out there, and loving every minute of it.”


Here’s the Seinfeld clip in question:

Having watched that, I’m not even sure a post is necessary. Kramer pretty much covers it. Still, not everyone has access to YouTube at work, so I’ll continue.

I’m not going to discuss the subjective effects of wearing boxers, briefs, or nothing at all. People have their preferences. Some people like providing a safe, secure, snug house for their boys, while others take a more free-range approach. No value judgements cast here.

But what’s our natural state?

While it could be argued that going commando is “most natural,” seeing as how we’re all born in the Hanes-less state, I’d say that loose-fitting boxers are pretty close to natural, too. Loincloths were the earliest undergarments, and those were essentially just a piece of fabric loosely looped between the legs. Plenty of air flow and very little confinement. Grok’s private bits definitely breathed, whether he wore a loincloth or nothing. Okay, so one is more natural than the other(s), but does that make a difference for our health? Natural doesn’t always mean better, you know.

“Everyone knows” that wearing tight briefs reduces sperm count, and I briefly discussed this in a Dear Mark that asked about laptops and infertility. It’s true that scrotal heat stress does have the potential to affect sperm quality, count, and motility, as in men with varioceles – enlarged testicular veins that lead to excessive blood flow, elevated scrotal temperatures, and sometimes infertility – but it’s unclear whether choice of underwear represents a significant-enough thermal stress to the scrotum to induce negative changes. The questions we must ask are: does the choice of underwear truly affect scrotal temperatures? And if it does, is it sufficient to negatively affect male fertility? Let’s look at the evidence:

In one study, healthy young men wearing tight-fitting polyester-lined athletic support garments consistently displayed elevated scrotal temperatures between 0.8 and 1 degree C. This increase, however, did not affect any fertility parameters, including sperm concentration, sperm motility, sperm morphology, sperm viability, sperm hyperactivation, and the ability of sperm to penetrate hamster oocytes (sadly, no hamster-human hybrids were created throughout the course of this study).

Another study found no difference in scrotal temperatures between wearers of boxers and wears of briefs. In fact, the average temperature was actually a hair lower in the brief group, though it wasn’t significant. Fertility parameters all checked out, as well.

In another study, the author measured how various garments and positions affected his own scrotal temperature. Boxers were 0.5 degrees C cooler than briefs. Scrotal slit underpants were 1.2 degrees cooler than boxers. Sitting with thighs apart was 1.6 degrees cooler than sitting with thighs together. He didn’t measure his fertility parameters, however, so we don’t know whether or not those were affected.

And finally, a team of researchers studied the effects of boxers, briefs, and going commando on the scrotal temperatures of 50 healthy men without a history of infertility. They found conclusive evidence that wearing tight-fitting underwear such as briefs resulted in elevated scrotal temperatures, though it “remains to be elucidated whether these differences are linked to semen quality and consequently male fertility.”

Choice of fabric might make a difference, too. In an Egyptian study, one researcher used polyester slings (that allowed penis exposure but kept the scrotum confined) to induce azoospermia – the state of having no measurable sperm in semen – in previously fertile men. These were like briefs on steroids, fully preventing the tendency of the scrotum to “hang low” (which it does for thermoregulatory purposes). They caused the testicular temperatures to approach the rectal temperatures, which is way hotter than testicles are built to withstand and which apparently contributed to the infertility. But the author also thought that scrotal-polyester friction-induced electrostatic charges might have played a role as well. To figure out which was responsible, that same researcher did a followup study, this time using dogs in specially-fitted underwear. To eliminate the confounder of scrotal temperature, he made the underwear loose fitting. And sure enough, testicular temperature didn’t change much. Not even in the polyester group. The dogs wore the underwear for 12 months straight. Once again, the polyester underpants killed fertility (without affecting temperature), while cotton underwear dogs and control dogs (commando) experienced no change. I was alive during the seventies, and I can certainly vouch for the friction that occurs between bare skin and polyester.

As for the hormonal stuff? While scrotal temperature changes do affect follicle stimulating hormone, which controls sperm quality and count, they do not seem to affect testosterone levels. Fertility can be affected, but not via testosterone.

I wish I could give you an absolute proclamation, here, but I can’t. How about some general guidance?

  • If you’re having trouble conceiving, or your sperm count comes back low, and you wear briefs or some other tight-fitting underwear, switching to boxers, or cotton, or nothing at all might help. Either way, it’s not going to hurt.
  • Normal scrotal temperature – the kind that promotes fertility – is one or two degrees C below body temperature. As seen in the Egyptian study, once the scrotal temperature approached the rectal (body) temperature, fertility was impaired. The best way to measure your scrotal temperature is with an infrared thermometer, which can be a bit pricey.
  • Don’t wear tight fitting underwear – polyester or not – for 12 months straight. Give your boys some time off, whether that comes through targeted ice baths, walking around (walking and standing and even running lead to cooler scrotums than sitting) more, or switching to more forgiving undergarments.
  • Switch to a natural fabric, whether it’s cotton, animal skin, or nothing.
  • Don’t be in such a rush to always replace your underwear with a gaping hole in the crotch. It might actually be helping, especially if it facilitates scrotal drooping.

Thus, as is usually the case, there’s no right or wrong answer here. While wearing tight-fitting briefs can increase scrotal temperature, which can affect fertility, it’s not a sure thing. The research is unclear, and the ultimate choice rests in your hands. Go ahead and mess around with infrared thermometers if you’re really concerned, and get your sperm count tested, but you probably don’t have much to worry about as long as you’re adhering to the general guidelines listed above.

So, dear readers, what say you – boxers or briefs?

You want comments? We got comments:

Imagine you’re George Clooney. Take a moment to admire your grooming and wit. Okay, now imagine someone walks up to you and asks, “What’s your name?” You say, “I’m George Clooney.” Or maybe you say, “I’m the Clooninator!” You don’t say “I’m George of George Clooney Sells Movies Blog” and you certainly don’t say, “I’m Clooney Weight Loss Plan”. So while spam is technically meat, it ain’t anywhere near Primal. Please nickname yourself something your friends would call you.

  1. That’s it – my better half is getting a loincloth for Christmas!

    Primal V wrote on November 6th, 2012
  2. What about during workouts? Especially runs and sprints. I was always told to wear tight underwear during runs to prevent things from bouncing around too much and getting damaged.

    Steve the Pilot wrote on November 6th, 2012
    • Let your junk bounce free!!!

      dennis wrote on November 6th, 2012
      • I use under armor compression shorts when I work out. I find that there is less chaffing than if I wear boxers. If my balls are really tight against my body for an hour or two, will that have a negative impact on fertility?

        Wayne wrote on November 6th, 2012
        • these are made out of poly type stuff right?

          lockard wrote on November 6th, 2012
    • I’ve always been under the impression during sprints you need to wear tight fitting boxer briefs to avoid testicular twisting where the bloods supply can get cut off. A quick google calls it “testicular tortion”. Seems some other issues may be at play but I’m going to protect the boys during exercise with some boxer briefs.

      Luke DePron wrote on November 6th, 2012
      • I knew a guy who had to have surgery to correct that. Quite painful. Not that I have any insight as to the current topic. Just felt like sharing.

        Ben wrote on November 6th, 2012
  3. Cotton=pesticides Hemp or cotton=no pesticides. I wear hemp boxers although pricey at $38 a pair, best pair of underwear I ever owned. I have two pair and me thinks I need them in all the colors.

    dennis wrote on November 6th, 2012
    • i mean organic cotton=no pesticides

      dennis wrote on November 6th, 2012
  4. I turned my back on underwear several years ago, I let the boys hang loose as nature intended.

    rob wrote on November 6th, 2012
  5. I can pretty much guarantee the comment of the week will come from this article. I’d be willing to bet it also uses the phrase “scrotal drooping.”

    steve wrote on November 6th, 2012
  6. “What’s worn under the kilt?”
    “Nothing, ma’am, it’s all in perfect working order.”

    andyinsdca wrote on November 6th, 2012
  7. Well, I’m definitely partial to boxer briefs. They’re so cute!

    Dani wrote on November 6th, 2012
    • That’s what this Toad where’s – exefficio boxer briefs. Perfect for traveling :)

      Primal Toad wrote on November 6th, 2012
      • I totally agree Sir! Exofficio has been a real pleasure to wear :)

        Vishnu N S wrote on November 4th, 2013
  8. A greater and more overlooked threat to your swimmies is your cellphone kept in a pants pocket. Grok sure as hell never thought that microwaving his ball sack would be a good idea, neither should you.

    J. Delancy wrote on November 6th, 2012
    • luckily its getting cold so my cellphone will be kept in my jacket pocket, so hopefully someone wont be stealing my outdated droid x

      dennis wrote on November 6th, 2012
    • So true. I’ve been keeping my cell phone in my backpack more recently to not spend so much time on it. I guess this is a side benefit!

      Primal Toad wrote on November 6th, 2012
    • holy crap!!! XD lol

      Siren wrote on November 6th, 2012
    • I really need to start keeping it in my backpack when walking to class.

      Jordan Tuwiner wrote on November 6th, 2012
  9. Middle-aged comedians joke about their sagging ballsacks. How they have to move them to sit. How the dangling mess is always in the way. Like a bra, tighty whities support that thin skin so you aren’t a sagging mess later in life. Your decision but plan for your future.

    K wrote on November 6th, 2012
    • It is my understanding that it is a myth that bras prevent breasts from sagging.

      Marisa wrote on November 6th, 2012
      • It is totally a myth about bras preventing anything except fun.

        W.J. Purifoy wrote on November 6th, 2012
        • Actually, Bras prevent breast ligaments from over stretching. While they might not eliminate all possibility of saggy boobs, a proper fitting bra will definitely help prevent breasts from sagging (ask my 92 year old grandmother, haha).

          Ann wrote on November 7th, 2012
      • It is a myth indeed, as far as I can tell. While bras do prevent the ligaments from stretching, they also prevent the ligaments from doing their job of holding up a breast. So, they get weak and it leads to sag anyway. Those puppies are going to sag if they want to no matter what we do. Non-sagging seems to be completely out of our control.

        Lauren wrote on November 8th, 2012
      • Without embarrassing my little mum, she’s still pert at 81, and I’m in the footsteps at 47. Of course, micro-bosoms are gravity-agnostic to start with…

        Joy Beer wrote on November 11th, 2012
        • Point being that bras may help.

          Joy Beer wrote on November 11th, 2012
    • It’s my understanding, thin skin is a result of natural aging, and cannot be prevented by garmentry.

      In other words, skin continues to lose it’s bouyancy with age. Nothing will ever prevent the droop bar surgery.

      Chris wrote on November 7th, 2012
  10. Totally anecdotal, but… my husband has always required a snug home for his boys, and we’ve got four kids…

    wendy wrote on November 6th, 2012
    • serves me right for reading the comments… did not need to know, mom!! 😀

      squelchbaker wrote on November 10th, 2012
      • Ha ha that was quite a funny incident!

        Vishnu N S wrote on November 4th, 2013
  11. At my age, I could honestly care less about fertility :) but…I still go commando. an old habit from the military that I have yet to experience any desire to break.

    I also run and work out with the same. throw on the sweats and go. I have never experienced any issues with soreness or anything else even in full sprints. only time i get sore is when im getting kicked there :)But, that’s what cups are for.

    Malachi wrote on November 6th, 2012
  12. I was a boxer dude my whole life. I now own 3 pair of exefficio boxer briefs. They are PERFECT for traveling. I wash them in the shower and they can dry in a few hours.

    This: (NOT an affiliate link)

    Ah the simple life is so beautiful….i

    Primal Toad wrote on November 6th, 2012
    • I’ve actually had better results with Merino Wool than Exefficio.

      I recommend Smartwool underwear, and Icebreaker shirts.

      It’s INCREDIBLY comfortable, organic, AND flame resistant.

      Seph wrote on November 8th, 2012
  13. equal time between boxer-briefs and just boxers. Gave up the tighty whities in college. They just felt embarrassing to wear.

    Matt wrote on November 6th, 2012
    • it took you til college to realize tighty whities weren’t cool…?

      jake wrote on November 6th, 2012
  14. My father’s 93, a boxer fan all his life, he’s hanging down around his knees. I think you got to mix it up, if you hearing “Born Free” when you wake up go Commando! I’m just sayin……..

    Ailo wrote on November 6th, 2012
  15. “Fill your cup”… Really Mark??? LOL

    tcady wrote on November 6th, 2012
    • That was my thought also. LOL

      JoanieL wrote on November 8th, 2012
  16. After my third child was born (and I always wore tighty whities then) I had a vasectomy (so long ago the doctor used a stone knife). So the sperm issue became a non-issue and my wife and I had a lot more spontaneous fun. Then, in my 30’s I went commando, in my 40’s, boxers, and in my late 50’s I switched to boxer briefs, which suit me just fine.

    D. M. Mitchell wrote on November 6th, 2012
    • Forgot to mention: When my children were born I was living in Arizona (Mesa, Phoenix area) and working outside doing construction work in the sometimes incredible heat. So I know my boys got really hot most summer days.

      D. M. Mitchell wrote on November 6th, 2012
  17. I recommend getting a vasectomy and not worrying about it.

    Groktimus Primal wrote on November 6th, 2012
    • +1 :-)

      Meghan wrote on November 7th, 2012
  18. We live in Florida, and my fiance used to love his boxer briefs. Loved the support, he said. They got so worn out that I bought him a new pack about a year and a half ago, but the same size was so incredibly tight and uncomfortable (evidently the old ones were REALLY worn out) that he started letting it all hang free. He says it’s much, much cooler during the summer now, far fewer incidents of sweaty man parts. Never having had sweaty man parts myself, I can only assume it isn’t pleasant. Here’s to being naked under our clothes.

    Kristina wrote on November 6th, 2012
  19. One word: Kilt!

    Morghan wrote on November 6th, 2012
  20. This confirms my choice to go commando about 70% of the time. And yes, I gotta hook up a kilt soon.

    Revo Luzione wrote on November 6th, 2012
  21. Fascinating topic:)

    chocolatechip69 wrote on November 6th, 2012
  22. “I was alive during the seventies, and I can certainly vouch for the friction that occurs between bare skin and polyester.”

    L – O – L!

    HopelessDreamer wrote on November 6th, 2012
    • Yet another use for butter and oils.

      Animanarchy wrote on November 9th, 2012
  23. Rectum? Damn near killed’em!

    Paleo Bon Rurgundy wrote on November 6th, 2012
    • I live for your hilarious, witty comments!

      Donna wrote on November 6th, 2012

  24. “What’s worn under the kilt?”
    “Nothing, ma’am, it’s all in perfect working order.””

    If you wear anything under it, it is a skirt

    john wrote on November 6th, 2012
    • I wear robes, you know like hefty robes that Greek scholars or Shogun use to wear. Amazing!

      Peacemaker wrote on November 6th, 2012
      • Aren’t socks almost universally worn under the kilt?

        Tom wrote on November 7th, 2012
        • I wear lipstick under mine

          Kevin wrote on November 7th, 2012
        • Traditionally? No. The English decided to tell the Scots what Scottish fashion and heritage was a couple centuries ago (in an attempt to make them more loyal or something). Prior to that all Scots were barefoot at all times, including winter, and including even the highest nobles.

          Bill C wrote on November 7th, 2012
    • “What’s worn under the kilt?”



      Joanne wrote on November 8th, 2012
  25. Boxers are the most comfortable imho. Gotta love the levity of MDA haha

    Ben Hirshberg wrote on November 6th, 2012
  26. I just want to see the thermometer they used.

    DB wrote on November 6th, 2012
  27. I wear boxer-briefs.

    Chris wrote on November 6th, 2012
  28. Do your balls hang low, do they waggle too and fro~

    Sorry, couldn’t resist. XD

    Aria wrote on November 6th, 2012
    • Can you tie ’em in a knot?
      Can you tie ’em in a bow?

      John wrote on November 6th, 2012
      • Can you throw them over your shoulder?

        Paleo Bon Rurgundy wrote on November 6th, 2012
        • Like a continental soldier?

          Tom wrote on November 7th, 2012
      • Would you like them
        in a house?
        Would you like them
        with a mouse?

        In the dark?
        Here in the dark!
        Would you, could you, in the dark?

        Would you, could you,
        in the rain?

        Could you, would you,
        with a goat? Er, forget that.

        Would you? Could you?
        in a car?
        Eat them! Eat them!
        Here they are!

        Jeff wrote on November 8th, 2012
  29. I’m a big fan of ScottEVest “Travel Boxers 2.0”, with not one, but *two* pockets in them, and a button to close the fly for those modest times, and dry-fast fabric to wash in the sink while you’re on the road a lot (like me).

    Randal L. Schwartz wrote on November 6th, 2012
  30. I love men’s boxers (for me) for sleeping.

    I have a stack of 2(x)its brand, size small, plain white. So soft. They’re perfect with a long sleeved white tee shirt (I have a stack of those too, from places I’ve traveled).

    The perfect jammies. :-)

    Susan Alexander wrote on November 6th, 2012
    • Now my boxer briefs are feeling a bit more snug.

      Art Vandele wrote on November 6th, 2012
      • Way to be a creep, dude. How can you think for just one second this is appropriate behavior?

        faywray wrote on November 8th, 2012
  31. Typo – it’s 2(x)ist, not 2(x)its.

    Susan Alexander wrote on November 6th, 2012
  32. I was a young teen in the 90’s when it was fashionable for females to wear men’s boxers under their overalls, and even jeans. I remember not liking to go with that trend too often becuase it was really uncomfortable having all that extra fabric from ther boxers. I’m not sure how that’s comfortable for you men. I am not male, but enjoy going commando a lot of the time. It just feels most natural, even as a woman.

    Sarah A. wrote on November 6th, 2012
    • amen.

      W.J. Purifoy wrote on November 6th, 2012
  33. I think this is my favorite article — and comments section — yet XD

    M. wrote on November 6th, 2012
    • amen, again.

      W.J. Purifoy wrote on November 6th, 2012
  34. Well, I’m good my clothes(At home!) Are robes, yes, many robes, and sometimes a loin cloth, or quality boxers. Very, very comfortable. Warning: Do not go commando while wearing jeans! You can guess why.

    Peacemaker wrote on November 6th, 2012
    • I was going to say, the one downside to commando are zippers.

      Chris wrote on November 7th, 2012
  35. I would be more concerned about the risk of strangulated testicle from tight underclothes.
    This happened to friend of mine at school and is probably the most painful injury that can befall a man.

    Anon wrote on November 6th, 2012
  36. Sorry, can’t wear boxers because I get hard easily, even when the wind blows…

    But I’m thinking about putting in shoe eyelets in my undies!

    bubbajank wrote on November 6th, 2012
  37. wow I swear I was just thinking about searching this topic on MDA today. recently I switched to briefs for comfort and flexibility during workouts. I don’t really like em the rest of the time though.

    Maninthebox22 wrote on November 6th, 2012
  38. Tomorrow on MDA: thongs vs bikinis!

    my primal hubby has been going commando since we started dating 23 years ago.. our 5-year old son refuses to wear underwear too.. like father, like son

    mars wrote on November 6th, 2012

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