Kissing the window?

Any speculations as to what purpose that served? Her and her friend had just spent the night before talking and joking about being with someone for money only and then she brazenly approaches the car and causes him to cream his shorts in such an otherwise innocent gesture.
Interesting that he returned however much time after he gave her the ride to begin with but I will never be convinced it was just him being a nasty old/er man taking advantage of a young girl/child either.