There are also plenty of group sex parties that are only around for a few months.
Buenos Aires can be a treacherous place if you allow yourself to get caught up in the moment, or be pressured by aggressive people working for bars and cabarets.
They publish comments on escorts as well as reports on their on discussion forum.
Taxi drivers can be a good resource.
Because of that we put a ton of links to all of the different clubs and urge you to contact them or do more research before you go.
In short: nothing good can come from following strangers who approach you on unless you know the turf.