I don't care what men think and their opinions have no bearings on whether or not I wear a bra. My husband (who also happens to be male ;P) keeps telling me to go braless but honestly my boobs are just too big and it really would not be attractive. At all. Trust.
But bras suck so badly. I do think wearing a bra weakens the ligaments that support the breast over time. And that not wearing one will strengthen them, so maybe that's what you're experiencing? And if so, that rocks.
And everything zeera said.
I look forward to the day we can discuss some kind of women's issue here without any men telling us we need to add photographs.