We would suggest starting off in Imagine bar in the Cita. It's more of a social swingers bar run by swingers for swingers. A nice safe place to find your feet and most of the clubs are only a few minutes walk if you fancy moving on.
Hope this helps
16th Jan to 4th Feb for us. All the usual places - Imagine, Comeback and whatever clubs people are heading for. Always happy to meet new people, singles, couples or groups.