There used to be a "sex club" here in San Jose years ago. It was more of a sex party house ran by a swinger couple. It was open to couples and BYOB. This was a time before safe sex and condoms so the worst you might catch was gonorrhea. The couple would allow a few single guys in so to keep the ratio of men to women fairly close. The worst thing about it was people sitting around for hours getting the courage to make a move. As a single guy, you never make the first move. A few times a couple would approach me and we'd go to one of the private rooms. Just regular sex, nothing kinky. Every once in awhile the couple that ran it would get involved (he was older, she was in her mid 30's). The husband would watch me fuck his wife and jack off. And as a rule no guy on guy but woman on woman was acceptable.
Been to a gay bathhouse in San Jose and done just about anything two or more guys can do together. Oral anal, fisting, 4 ways, golden showers, had a guy eat my ass for must have been 20 minutes while he jacked off his 4" penis. Even tried double anal on a guy with a guy who looked like Lexington Steel (it wasn't him BTW). I even meet a gay porn actor there who liked to be fucked for hours. He could handle a serious ass fucking and I know from watching him he would take 10 or 11 guys before he would call it quits.
Went to The Power Exchange up in SF years ago, but spent most of my time getting sucked my guys since 90% of the women I saw there were just there to watch. Hell, I got more sex at adult book stores on a slow night.