Prostitution doesn't happen in bathroom stalls at airports, bus stations, or malls. Men can't loiter around women's bathrooms waiting for the next lucky lady to wander by. Women that you would actually want to have sex with, don't "work" like that. Glory holes, anonymous bathroom sex, and the ilk are male phenomena. Whether the males are all actually gay or not may be debatable, but the act of seeking out free sexual partners in public places like that is pretty much limited to men. Cause we are sick bastards.