How common is to have an affair in Zurich?

I recently moved to Zurich, in my early 30s. I have a big appetite for adrenaline and I've always been into BDSM. For me nothing compares with the thrill of an affair where 2 ppl just can't have enough but in the same time it feels so wrong.

I know I may be judged for my behaviour, but I've come to accept the terms of who I am and how I like to live my life.