I'm going to re-post a contribution I made on a recent relationships thread.
I find it hard to explain to the [namechangeguys and wallabys] of this world why it's a problem. This isn't because there is no problem, it's that the argument is wide-ranging and complex. I'll have another go at compacting it.
Men who frequent strip clubs find it hard to grasp the concept of 'objectification'. You imagine what you think it would be like to show off your body for mass sexual admiration, and you imagine it would be okay. I have, now and again, taken part in reverse objectification exercises and, once, worked in a predominantly female place where a young man was sexually harassed. On all those occasions the men were hurt, indignant and upset.
The matters of objectification and harassment affect all women. It's unpleasant. For strippers it is a thousand times worse. I've sat next to groups of men treating their dancers like cuts of meat. If you can imagine standing naked in front of a pack of clothed drunks, on whom you depend for your wages, as they slag off the shape of your arse and the arrangement of your face, do so. Imagine having to apologise to them for the testicles god gave you, which they might deem too dangly, having to smile and to laugh ingratiatingly when they grab at your skin. Dancers go through it all the time.
Even if you are not such a boor, your very presence there - the mere fact you've paid for people to present their naked selves as consumables - endorses this trade. By paying money to a strip bar, you have objectified the women working in it ... and, by extension, all women. Because it's not possible to objectify women in location A, at X o'clock, and then not objectify them at location B, two hours later.
When a woman has 'esteem issues' related to a partner who uses strippers, she isn't suffering simple body envy. She is suffering the knowledge that her man, whom she loves, objectifies and judges women on the details of their bodies. She can't help but sense he judges her the same way. Thus, she misguidedly tries to be 'good enough' physically for him. The problem, of course, is that he doesn't see it as either/or: he does not consciously set his wife in competition with his dancers. But he has done so, all the same, because he's re-cast women as consumable objects, and she is a woman.