I've had a LOT of sex in my cars (and cars belonging toother film studios) while doing porn in them. Lots of head on freeways, sex in parking lots, behind buildings, in broad daylight using the hood to do "it" on, etc. Heck, there's nothing wrong with using cars--they're better than many of the places we use for sex (in porn, beds aren't used much; instead, it seems like Directors choose the most out-of-the-ordinary places, like rock piles, on top of washing machines, floors, kitchen counters, etc).
Dave
www.davecummings.com