When I watch a porn, I only look at the parts that aren't meant to be seen in public. I couldn't care less about her personality. All that aside, there's no chance I would go out on a date with one of those girls.
People have been doing "extra" things to enhance sex since the beginning of time. Males are very visually-oriented people. If your body isn't new and exciting, he will visually use some picture to enhance his enjoyment. It's not about the porn either. If you can find some way to be sure to take it all away, he'll just be thinking about other people. That won't stop. Even if your body was flawless, that won't stop him from wishing to experience a variety. Since he knows that the full experience is out-of-the-question, he's fine with visual depictions.e
If you are threatened and/or offended by his porn-watching, talk to him about it. If it still doesn't stop, decide if it's something to break-up over. Who knows, if you open yourself up to it, you might find something enticing about it for yourself.