Nude guys and lots of action there. But... if you do not like small claustrophobic basements, or disgusting leaking toilets or very expensive (12 euros) drinks or if you do not smoke and think all bars are smoke-free in Spain now, you should avoid this place.
This is a nudist club, out of the gay scene and generally attended by attitude-free and no-scene gay and bi guys. great group play going on from 3.00 a.m. or so, best on Friday and Saturday nights, less crowded on Thursdays and Sundays. Don't go there if you are a muscled guy only playing with muscled guys, a bear only playing with bears, a 20 year older only playing with 20 year olders, and so on: in this place, everybody is just playing with anybody else, all night long!