The best car is a silver Firebird with black racing stripes owned by Benton Hodges, a senior communications major. His car is such a head turner, he says several female students have even offered him some back-seat action in exchange for a ride.
Yes, back seat action means anything from kissing to having sex in the car, because often, especially for young people who still live at home, this is the only place they can get privacy.
They would take a drive to a remote place, maybe a hill or a lake with a nice view... to see the view of course..... then the boy will put his arm around the girl....... enjoying the view of course..... and then they'll kiss.....
The word "action" can be used as a slang way to talk about sex. It's a crude but fun way to say it without SAYING IT.
A guy might say to his friend, "Did you get any action last night?"
"I haven't had any action in over a year. "
"Watch out for him, he's only looking for some action."
It is very clear when used in those ways that the person means sex.