Most women value their health beyond idiots who demand BBFS. The ones that don't, yes, have low self-esteem, and might be forced by the market to provide it. Do you really want to be that guy, the one that pushes a poor girl into barebacking every similarly low self-esteem loser who walks through the door? These are disease vectors that target the horny and the desperate. Do you want to be part of that? Also Prep and HIV cocktails don't prevent lots of noxious STD's. And yes, all other things being equal, a women in the sex trade to make money prefers not to use condoms. It has nothing at all to do with her primary motivation of making money. It just feels better.