YRC, it is only not ridiculous to ponder it, if you don't think women are really as human as men.
Seriously, imagine sitting in a classroom and debating whether men would choose to offer their arses to anyone who came along with money and as long as they are not beaten up, threatened, hurt or frightened, why would anyone not do it?
Apart from the fact that you simply cannot separate prostitution from the abuse that goes with it. The sort of men who can't see anything wrong with paying a woman to allow him to penetrate her body, are the sort of men who don't consider women really human, so by definition, they have extremely abusive attitudes to women and are more likely to beat them up, rape them, humiliate them etc.
I'm sorry if you think that answer is ridculing you, it's not meant to; it's just pointing out the bleedin' obvious. It's not seen as bleedin' obvious by wider society, because women are still having to fight to be seen as fully human and the idea that you know, they might want to have some bodily integrity and dignity and have a RIGHT to have that, is still a really revolutionary concept.