Can someone tells me exactly what "Ladies Drink Free" is all about? I've seen this on a bunch of the Cancun clubs' websites. Does it mean Ladies pay a cover charge, but once inside, it's an open bar for them? Does it mean they don't pay a cover? Does it mean they pay a cover and only certain drink is free? It's not very clear, so I was wondering if someone can help me out and let me know what the catch is.