Frankfurt Swinger Club visit [M/F, M/F] and [M]e

I was visiting Frankfurt last weekend and I decided it had been too long since I've found myself in any sort of group sex scenario. I yearn for these encounters. See my post history for a few other stories on this topic.

So I look up a club online and can't really find any information or English reviews but it is in the city and reachable by public transit so I decide I can go check it out and if it looks sketchy I can always turn around and go back to my hotel.

I get to this place that is basically down an alley way next to a petrol station and I'm thinking I've made a horrible mistake. Only as I get closer to their front gate I can see inside a bit and I see a jacuzzi and a bar and some people sitting around patio furniture semi-nude. They look normal enough so I breathe deep and ring the buzzer. I'm let in and follow some stairs up to a receptionist who takes my entrance fee (80€) and directs me to a changing room. Dress code is basically underwear.