Stuttgart in february - any recommendations?

I scrolled down to see if maybe someone had already asked about Stuttgart and I don't see any search ability.

I am meeting a female friend at the end of the month for 3 days in Stuttgart. Unfortunately it's during the middle of the week. She can be pretty adventurous, but she has to feel safe. Any recommendations for adult swing clubs, FKK places, places for me to get her a sexy massage, or even a sauna? Thanks.