I went to my first Nob Hill "sex show" in late October, 2017......it was somewhat staged/choreographed, but not bad.....the two dudes stopped every few minutes to mine the audience for tips, then got back at it on stage.....no full-on anal sex, but I think there were perfunctory blow jobs, passionate kissing, etc.....I think one or both got off, but it wasn't obvious with the music and lighting......however, the audience member a few seats away from me was certainly going at it with himself......
I asked a staff member if the sex shows ever include full-on anal sex and he, honestly, I believe, said it's up to the individual performers to decide themselves what they'll do......