I find it interesting that bodybuilders before 1990, wore the same things that were popular for men to wear on the beach. No man wears a thong on the beach in today's swim wear style. He'd look gay. Oh, of course...
Alright. i'll admit. They aren't exactly thongs, but they resemble the those things girls wear that are not quite full underwear, but not quite a thong. Either way, I've never seen a straight man wear that.