I may be visiting Vienna. I know Europe has a different mentality about sex. Are there sex clubs and swingers clubs, or just good strip joints in Vienna? Where would a single guy go to find some fun?

I haven't been to this club in Vienna, a very staid town BTW, but I have been to clubs with the same name in neighboring countries and they were all fun. https://www.tripadvisor.com/Attraction_Review-g190454-d3192382-Reviews-Nightclub_Maxim_Wien-Vienna.html
Enjoy

Thanks! This is a nice start.

Check out the Goldentime Saunaclub. Their website gives a good idea what to expect.

There are a couple of porn cinemas as well if you are more of an exhibitionist.

Are there really still porn cinemas? I'd love to Jack in front of strangers. Probably no women or couples, which is what I'd really like, but I've never really got to live my exhibitionism, so it gets me hard to think about it.