I'm glad you're getting your hormones checked! Finally, someone is listening to me
I think it's great that you have such a relaxed attitude to sex. It doesn't need to be especially reserved for two people who are besotted with each other: some of the best sex can happen with the excitement of a new partner, or a stranger. I've never had sex with a friend (get worried about being smothered with love) but if you enjoy it then why not?
Unfortunately I seem to have developed huge issues about sex in the last few years. My past caught up with me, and I can't seem to get out of this mental rut and trust anyone.