Falling in love with the woman-of-the-moment is the goal, the point, and the value. If I didn't need the emotions that belong with sex, I could handle the sex mechanics all by myself. But I want to meet, and play with, and adore, a real woman sometimes. I want that enough to pay the price.
The key is to fall out of love quickly enough, before doing something stupid in a pink haze. Before your next session, for sure. Before your next serious conversation (about anything) with your wife, for sure.
I cannot comprehend guys who pay a hooker "just to get a nut". Nuts are handy, free, easy, and without risk of sin or crime. Why complicate things if that's all you want?