Most prostitution begins in bars. Prostitution here referring to both the women and their clients.

I once ate lunch in a bar which was known for very good cooking. There were two sets of waiters. If you buy beer or any form of alcohol, you get served by a certain beauty dressed in a tight and very, very short miniskirt with heavy make up. If you order just food, you get served by some less appealing women who were dressed in very conservative oversized uniforms.

Then of course there are Pro-stitutes who just sit around in bars waiting for their customers. Somewhere, they even helped employees of the bar clean up and prepare for customers for free, so they could be allowed to hang around. There is a certain girl, a bar waitress who was fired by her employer. The customers were touching her inappropriately as she served them and her employer did not expect her to complain.

It's could also be because drunken men also part with their money fast and easily. Or maybe alcohol sears their conscience. Or there is something about alcohol that corrupts the human mind.