Specifically in this case, the saying is true - you like to go for a ride like to pay for your trip. And it's not about the money, because hitchhikers do not like to pay money - well, she did not pay. The driver combined business with pleasure: he found some company for the road, and in doing so, he threw off his tension. Although, for those who have watched it to the end, it's clear that the girl was just tricked. Maybe this will teach her to pay for the services she uses, instead of trying to get freebies everywhere!
The blonde thinks with her forehead, and he tells her nothing will happen to her if she sucks her dick and spreads her legs. Isn't that how she pays for tuition, cabs, and gifts? And now she's going to pay for living expenses. It's a good deal!