I’ve found men on adult friend finder, fetlife, Ashley Madison (married and unmarried men) and plenty of fish. I’ve heard only good things about sls and it seems to be the most popular swingers site from what I’ve read on forums but since I’m not in a large urban centre and like ongoing fwb I don’t look for hard core swingers anymore which is what I found on adult friend finder. Experienced swingers are the way to start in the lifestyle though I think. They know the basic lifestyle etiquette and will respect all your boundaries, they are also way more open minded to husbands watching than your basic hard up single guy