If you weren't having sex, and this was his only sexual release, I'd say there's a problem with your sex life that needs addressing, but that doesn't seem to be the case.
And props to you for trying to watch it with him. I love it when a partner wants to explore my private sexual world. Even if I'm not game for it, I appreciate the effort. But you don't seem to want to join in, you seem to want to watch because "you're good at reading people." Stop trying to be a creepy masturbation private investigator (which, by the way, sounds like the worst job on the planet).
Letting him know you know how and when he masturbates should be enough to get him to change his habits.
I understand your concern for his regard for your feelings. But if your guy was forbidden from watching porn, period, I do think his desire for you would increase, as would his desire for everyone else.
I think the more realistic option is to weigh his porn activities against your actual sex life and see if there's a real problem there. If he's using it to replace, as opposed to supplement, your sex life, it may make sense to have a chat about each other's needs.
After all, if this guy's going to be your husband, this would just be the beginning of your sex life, so best to nip it in the bud.
Does your guy watch porn? How do you feel about it?
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