Like Chams only more so - no street clothes outside the changing rooms, which would be by the door, with full nudity encouraged everywhere.
Outside swimming pool surrounded by an outdoor sex area with a variety of sizes of vinyl covered surfaces from couple to large group. We have been in one in France.
Something else we've seen in France, a stage with bed at the end of a large indoor play area, where attractive young couples/trios put on live sex shows to get everyone in the mood (much more erotic than the usual TV with porn DVDs). The people on stage could be club members with exhibitionist tendencies!
Totally dark large playroom.
Plenty of the usual small and large playrooms, some with mirrors which could be of the 'see through' variety for voyeurs, swing room and orgy rooms.
Jacuzzi or hot tub, sauna.
No disco! The idea is to have sex, not dance all night.
Plenty of secure parking.
Club cameraman, who would take pics or videos of those who want them, and ensure privacy for those people who didn't want pics.
Bedrooms for people staying over.
Bar of course!
That on-line room sounds intriguing, wonder how many would have the courage to play in it?