Remember that the SF Citadel is a BDSM club not a sex club as such. So if BDSM is what you seeking it will be just fine. If you are seeking just sex play, you may be disappointed. This is by no means intended to denigrate the SF Citadel nor the Society of Janus both of which are great institutions. I just wanted to make sure your expectations match the venue. If you are just seeking sex play and you are bi or gay there are several clubs, Eros, Blow Buddies, to name two. If you are straight there are a swinger clubs but usually limited to couples and they tend to be much more traditional on gender roles and gender identification. If you are a single heterosexual male your options are limited and often expensive unless you are already connected.