who knows... maybe it'll come out sooner or later... people are into all kinds of sick shit these days...
one pretty common one is asphyxiation... lots of people like to either choke or be choked during sex... some think it gives them a way better orgasm if they deprive themselves of oxygen right before they cum... personally I think it's fucking stupid, but to each their own...
whatever the deal is... if he's paying high dollar for an average looking chick like that, no doubt he's getting something special and nasty...
hell, he could be into scat... maybe even
reshitting