I'll take a bed over a car any day, LOL.
The last time I had sex in a car/truck...I was living with a lady friend of mine and we had just started having sex. We left a club one night and both of us were a little lit up, so I kicked up the stereo and that song "Closer" by Nine Inch Nails had just started.
I start looking at her and singing along with the song and when the lyrics "I want to fuck you like an ANIMAL" came up...she started stripping and was completely naked in the front seat of my truck in about 30 seconds.
I pulled off down a dirt road and it was ON!!!
LOL...good memories!