Pegging is a chance to walk in your partner's shoes sexually. As a woman you have to fuck your partner. As a man you have to allow someone to penetrate you and fuck you. It can be very enlightening. As a friend of mine said recently:
I want to grab this opportunity to honor my wonderful Wife. Two years ago, pegging was something that only those KINKY people did - you know, the kind who write letters to Dan Savage. Now, SHE asks ME if I feel like getting screwed. Now, it's ME who says we have to slow down, I need more foreplay. No kidding, this just happened a couple nights ago. I'm so grateful that I got to live to see this day!
This is what I mean about how pegging can change your entire relationship...for the better!