Klubbhead is right about the prices, 80 € entrance and you have a free bar all night long. There is a little dancefloor in the middle and plenty of hidden (and not so hidden) places to check out. Lots of peep holes lol
Unlike England, where single men can´t go to ´swingers´ clubs alone, at Beverleys they can so you can sometimes find much more single men, than couples or women.
However, i would say that the other couples that go regularly make it a very relaxing place.
My advice, go with a girl/guy but not alone.