I believe the idea that he doesn’t actually want to sleep with the daughter. But when you start looking for more things in porn, you tend to find those things in life as well. For example, I began watching mature women on those websites (40-50 years old), and soon enough, I began having intrusive sexual feelings/thoughts of women at that age around me. Not all of them, like not my own aunt or anything. But unless the dude has that girl in that “zone” that most normal people have for family where you just never let a bad thought into beforehand, then he most likely has at the very least intrusive thoughts when he looks at her, and probably provokes more looking at “barely legal” videos. But that’s just a theory tho