Gatorfan, I think you are mistaken. Progressives/liberals, what have you also try to go for moral high ground. I live in california and remember seeing on the news, when I was young, protests by individuals, groups, and politicians, all whom could not have been Conservatives. I know democrats that try to walk a fine line between morals and physical reality.
As for the puritan beliefs the second poster brought up, that reinforces it, but there is more in play then that as someone suggested that it may point towards being a cheater.
What it comes down to is the social norm. Sure, religions and political beliefs have played a role in it's development, but it is primarily rooted between how women perceive men that go to stripclubs. if you are single and go, then you must be a disgusting male that has been rejected by every female out there and that they should avoid you for good reason. They also start to think you have a loving relationship with prostitutes. If you are in a relationship then they start to think you are going because you want to be with someone else, or that you are. You also don't really love the one you are with because you want someone else and are willing to pay to see it.
It is how the idea of going online to check some porn can be seen as a reason to get a divorce for some. It is one thing if the guy just wants to check out some chicks, its another if he is online 12 hours a day looking at porn. One is actually normal, the other is a sign of a problem and most likely with the relationship, not the porn viewing individual's mind.
The reason I point out that this has nothing to do with puritan views is that not all cultures are influenced by them. Sure, you could attempt to say so here in America, but how many other nations can you name where people tend to have relationships consisting of 1 man and 1 woman, verus 1 male and many women, or 1 woman and many men in a relationship. I am not talking about cheaters, but living together in a relationship that the others of the same gender know and acknowledge each other. It is based upon this system of pairing of one of each gender together, no more.
The biggest problem is that people talk about getting a BJ from a stripper. Rumors of sleeping with the strippers and so on. This all adds up to a bad reputation, which leads women to see strip clubs as being nothing more then a brothel, therefore if you go you are a loser and a cheat.
Now if people know you can go in, have a drink, have a bit of a conversation, get a lapdance that is not you trying to bang the stripper, people might start to change their minds. In a sense if we can get the non-strippy women to stop feeling that their monopoly on men having sex is being threatened by women that will be upfront and honest by asking for the cash, then stripclubs would be easier for them to accept. They want to use sex as a means of controlling a man. If that control is threatened then they will react negatively because what is going to make a guy keep her around if he can go spend his money to get some? Her strength in a relationship is balanced out if the male can use one of his to gain what he wants.