hauptstimme saidYou do know the same bacteria that causes "Athletes Foot" also causes "Jock Itch"?
I believe it's a fungus, not a bacteria. But I've also read that it's difficult to destroy, even in the clothes washer. For that reason I never wash my socks and underwear together. I've also read a recommendation that men's underwear should be replaced every 6 months, even before it's worn out, because of fungus build-up. Not sure that's necessary, but I would decline the gym clothing offer.
Only time I ever wore another guy's things was to go swimming in 1968. I stopped to help these 2 other motorcyclists who were having engine problems in New York state. They said they were going to a state park, and invited me to ride my bike along after we got the broken one running, partly for their insurance. When we arrived there I saw it offered a large outdoor swimming pool that these 2 guys had planned to use, a nice idea after a hot summer ride. Except I didn't have a swimsuit with me.
They had ditty bags on their saddles, containing some shorts in case they went hiking at some point. So the 3 of us went into the large changing room where they gave me a pair of denim shorts, and one guy lent me his jock, while he went commando in his own swim trunks.
(In those days suit liners were less common than now, a special swim jock or regular supporter typically worn instead. Especially since many swim trunks still had very short legs, like the old-style gym shorts, past which your stuff could protrude, or at least be seen)
I thought it a bit odd to do this, but figured we'd be in the water, where the chlorine would keep things sanitary. I didn't yet know about fungus issues.
Some military gyms used to have a complimentary clothing issue if you hadn't brought your own, mainly for guys on travel status, that consisted of T-shirt, trunks, socks, jock and sneakers, presumably all sanitized. I was a bit uneasy with that, too, and uncomfortable, since the the jock would invariably be all stretched out and slack from too many washings, offering no more support than going commando.
And one college I attended would also issue a daily gym kit from the equipment room if you needed it, their saggy jocks likewise almost worthless. So in a way, "sharing" gym clothes used to be a regular policy, cause you were wearing stuff many dozens of other guys had used before you. Not sure that's done anywhere today.