As a guy, I think being fucked in the ass by a girl with a strap on is so intimate. To take a plastic cock up your ass is admitting that you’d let a guy fuck you. The girl doesn’t make judgments; she just lets you have the fantasy.
My ex used to like me to put a finger or two in his ass whole I was sucking his cock; thought it was weird but I've since found out that he wasn't alone, and that quite a few guys like it, inc my now boyfriend.