Boyfriend too into porn

My boyfriend watches porn and I understand that, I'm not always there when he gets the urge nor am I in the mood sometimes so he's gotta do what he's gotta do. But he references porn in real life... Like today I was talking about gymnasts and he was like eww all of te ones I've seen in porn have manly muscles and are big and I'm like in reality they're usually petite with muscles. And I showed him a picture of my friend who had a baby (a beautiful red head) and I was like hopefully the baby gets those genes she's gorgeous and his response was "meh I've seen hotter redheads in porn" and he's made a bunch of other references to it... He even compared my body to one of the stars saying she looked like me... I feel like I don't compare, some of these girls are gorgeous and do stuff I can't do. It's been 6 months of this and we have watched porn together (twice) so I feel like I'm too far deep now to start getting upset with him about it but how do I break it to him that none of this is real and that I'm getting pissed off?