So can't speak to what's going through your boyfriend's head; however, I know even if I'm loving the feel of oral, vaginal, or anal sex with my partner... it's harder for me to come to orgasm than when I masturbate to porn. I think in my case this has to due with growing up with the internet. I know there has been some discussions about current K-12 students are "growing up" faster, sexting, and trying things sexually that they maybe aren't really ready for due to this over exposure to sex/porn at their fingertips and in our TV/Movies.

But regardless, I know in my case it's that my body has been conditioned for years that watching porn = orgasm. As I went over 10 years of being single and masturbating before I eventually started dating and having sex with another. And as enjoyable as it is, I could totally see having sex while watching porn allowing me higher likelihood of sexual release. But I'm so focused usually while having sex of my partner's enjoyment, that I've never considered porn during sex and none of my SOs have suggested it either.

But it's likely just a case of over exposure to porn and there is nothing wrong with you; however, you should likely discuss this with him if it's bothering you.