I was fortunate enough to work out at the Gold's Gym in South of Market, San Francisco, from the late 90s to the mid 2010s, when there were many porn studios in active production. There was a steam room and a sauna where, after a work out, men would go to work that last muscle, often in the company of some of the planet's hottest men.
There were a few cock nazis, gay men who would project their own undesirability onto snitching, but we managed to work around them as even they began to annoy the staff.
The panoply of penis was nothing short of astounding. It was like being a grizzly bear on a prime Alaskan salmon stream where the fish were running year-round. If I did not connect with any given hot man, not to worry, there were 2 more coming down behind him.
I got to play with several well known porn stars, Cutler X, Jerry Stearns/Gary Stamina (a longer term suck buddy), Logan McRee, Leo Forte and a range of gym clients and staffers. One staffer, Johnny, was a bit femme but he was packing a 9"er that was molded perfectly to my throat.
A conservative gay supervisor, Scott Wiener, threw a hissy fit that men were playing in the Upper Market Gold's location and prevailed upon the management to close down the wet areas. The steam rooms and sauna were closed down. And at the SOMA location, shower stalls with curtains were replaced with stalls with closing doors.
That did not stop me and Jerry from mutual exhibiting from stalls across from one another, and very risky forays across to the other for some head.
I left FitnessSF as it had become a health club and switched to a more gym like gym. It has steam and sauna but is not a gay gym per se. There are occasional hook ups but they are very rare. Of course this is all closed down for now for pandemic control.