How do you usually handle people having sex in a car?

Was talking to a friend about how when we were younger, we used to hook up with girls in cars all the time. As an debatably mature adult, I would be pretty freaking paranoid to do that now. He seemed to think police will just usually send you on your way and it’s not a big deal.

So how do you guys usually handle catching people in flagrante delicto in their car? Depends on the location? If it’s a possible prostitution situation? If it’s two minors vs two adults? Or fuck it, straight to jail no matter what?