Then you'll have to say the same thing about masseurs and shoe-shine workers and a whole host of other "personal services." Imagine, asking a barber to shave your beard when you're perfectly capable of doing it yourself! For shame!Anyone can have sex with any of them anytime they choose. They could have sex with each other anytime they choose.
I know you don't. Because capitalism has poisoned your thinking the same way it has poisoned everyone else's. And now you think sexual assault is OK so long as you pay for their cooperation in the crime. Money doesn't make anyone want to have sex with someone. It doesn't buy their willing consent. It just buys their complicity in the sexual assault. But you can't see that.
Humans have always exploited other humans for their own desires, yes. But that never made it OK, and it doesn't make it OK, now.