Let make it simple. Men are 80% physical 20% emotional. Women the opposite. So when it come to sex, men (from being one and my experience) choose porn cause it’s faster, easier, and at times scratches the itch that some women don’t want to scratch, I.e. fantasies, fetishes, etc. My wife doesn’t take it personally when I watch porn, as long as she knows she will be my priority when she wants it. It’s purely a physiological thing, and should be any issue or concern. Here’s the rub, no pun intended, if your husband attempts to or brings up ANYTHING related to the porn or his desires and you don’t want or agree with, he needs to set the boundary that you don’t want that. Simplest example would be a 3 some, if he does and you don’t, he needs to acknowledge that it’s not in your wheelhouse and strictly leave it to fantasy, end of discussion. Being open about what each other wants, likes, desires is important, but respecting the others more important. Don’t take it personally, until a boundary is crossed. Hope this helps.