*coming up to him* Hey man, I was you before you got here, I know we don't always get along, but as someone who was in your shoes, someone who now does that with my own daughter, I can honestly say it really isn't about the sex, it's one hell of an experience, bonding on that level with your family. Look you don't have to like it, and nobody's saying you two should try it, but honestly, you're sorta missing out, look at how you're fighting now, do you see any of his kids being afraid to talk to him? Or upset, or traumatized, or afraid to be around him? From what I gather, most of them chose to continue it.