TotalMILF has a pretty good understanding of the situation I reckon.
A lot of guys just like to wank, it's just a thing we do, regardless if we've got all the sex we need or not.
But I can tell you form a male perspective, you shouldn't need to feel jealous or threatened by your man looking at porn. From personal experience, porn is something I look at with complete emotional detachment, it's just something to get me stimulated, and I dare say that is the case for most other males too.
I can understand you being upset because he lied to you, and was being sneeky about it. From your side it would comes across like he's hiding something from you. But I'd be willing to bet he probably felt rather embarrassed or ashamed and was worried how you'd react. Like push-pull pointed out, that's something that can be resolved with communication.
You're right though, a lot of porn is quite aggressive and demeaning towards women, even I find it quite off putting. You just have to hunt around for porn you like
I honestly think masturbation is a part of ones sex life, regardless of how much sex they're having with their partner or not. I had a partner once who would tell me about what she was thinking about to get her self off that morning, personally, I found the idea of her taking matters into her own hands (yes yes, I cracked a pun
) when I wasn't around to be a huge turn on.
Most guys do think about sex a lot. When my physical and mental health is in order I think about it nearly all the time. Most blokes don't let it affect them and how they conduct themselves around women, but unfortunately, some guys do.
But hey, I've come across women who are just as bad as well.