Do you see anything wrong with a woman trading up sex in exchange for things she needs or wants that she can't get by herself?

For example, I know a young woman who owns her own home, and won’t hesitate to have sex in exchange for the guy doing remodeling projects around her house…most recently she got a new kitchen floor out of it. When the project is done, they both move on. She’s happy, he’s happy.

Assuming pregnancy and STDs aren’t a problem, do you see anything wrong with it?