Like Michael Chui mentioned, I would suggest that you perhaps look at it with him. Maybe find some that you both enjoy.
If that's completely distasteful to you, you might want to think about why that is. There's nothing inherently *wrong* with porn nor masturbation. And there's no reason, imo, to curb either of them if it's not conflicting with other aspects of your life. (Or in this case, your bf's life.)
If your bf was not having sex with you because he was too busy with the porn, that would be a concern that you might want to get to the bottom of.
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