In my one lonely SPN story, I make mention of the fact that sex with the crossroads demon while she's inhabiting a maid's body certainly isn't consensual for the maid.

Having now seen the episode, I dunno if they're having sex or not. The writers were certainly implying it, but then the writers have been known to push us toward something purely as misdirection.

On another list someone suggested that this Kristy is actually Sam's lover (or partner or friend) and she lets Ruby borrow her body for short periods in order to communicate with Sam. I think that isn't likely or why what they pretend she was a one-night stand? But, I think it's a nifty premise that they could really do something with. Hell, Ruby could possess *Dean* in order to communicate with Sam.

Consensual possession. Huh. Castiel does it.