It is OK to go if you are married if you wife does not care.
Funny in life, I used to sell products to clubs many moons ago, So much depends on the level ( or class) of the club.
In most my guess is about 1/2 of the girls prefer other girls, and in many I have seen a lot of college girls who don't want you to know who they really are, this is just a pretend world for them and they would never get to know you in real life.
For others, some will, a few others will for 100 dollars.
There is no always answer. I would say 90 plus percent would never date a customer but that is just from the stories I used to hear security and dancers talking before or after hours.
But all of the dancers do normally date or are married to someone. So you never know.