an NylonspleaseX :Seems obvious to me. He can get the sensation of pumping away in a wet fanny at home. What he's paying for is what his wife won't give him, i.e. the feeling of having a living sex doll to play with, who won't judge him no matter what he asks for; feet licking, bum sniffing, dirty talk, licking her while she stands over him like a goddess, whatever... He's paying for being able to express himself sexually with someone who'll do what he asks and smile lovingly at him while she does it.