Thank you! I personally am far from convinced that the Impala is female. If (s)he actually possesses a sex, I'd vote for male, but (s)he'll go along with what Dean says anyway. Sam's attempt to classify her as female despite the body was part of his not-entirely-successful attempt to disassociate her from Dean.

Sex with the car is the weird part, but it's not the important part.

I feel pretty sorry for that guy, actually. Supernatural aside, I find it hard to see who he was harming.