I really believe that we're seeing more and more guys on here say they struggle with that, and I'm one of them too. Once you get exposed to porn at a young age (for me it was 12), your sexual responses can get wired to porn and not as much to real life girls, and when some guys have gone to bed with a girl after this prolonged exposure, they've found that they had trouble performing and finishing too. This is when the cuckold thing can become so appealing, because you're so used to watching other people have sex and masturbating to it instead of being an active participant with a partner. Some have even gone through with it and asked the girls that they've been dating and having trouble with in bed to do it. All of this except asking a girl to do it has happened to me, I've had a few cuckold fantasies after realizing that I was having performance issues as a result of PMO addiction. But the bright side is that I feel like interest in this decreases the longer you abstain from PMO and can go away altogether if you successfully kick your habit. It is pretty a pretty alarming trend though, because I feel like a lot of cuck relationships aren't sustainable in the long run.