Punting is an odd pastime in that it's socially "unacceptable" and unless say, you're in a committed relationship which cannot satisfy your needs and you have an agreement with your SO, then you're probably hiding it from the people who care about you.
So, it's borne of sexual and emotional need, which for me is about loneliness. London is a busy, unfriendly city and I work way too much to be social enough for a relationship. So while this takes care of physical, visceral needs, it's never enough to satisfy me emotionally in the long term. I can enjoy a punt on a purely physical level, but it can't deliver what I want most in a relationship with a woman.
When I first started, it was about fucking every kind of woman I could meet - race, age, body type. That gets old really quickly. You never get tired of fucking, but you do get tired of emppty fucking. Just like porn, there's an increasing need for variety in order to stimulate, and that's where things can get weird.