Am i over reacting

You say "it explains why we don't have as much sex" but it's way more likely a symptom then a cause. ie There are other reasons why you're not having as much sex and that's what you really need to think about and talk to him about.

There could be a bunch of reasons for that. But more than likely he's jerking off BECAUSE you're not having sex, not the other way round.

At least he's got a health sex drive, so that's a good thing.

It's not the reason you guys aren't having sex, but it's an effect of it.

Him doing that though doesn't mean he doesn't want to have sex with you.

Have you tried talking to him about you guys not having sex?

Maybe too many not tonight dear I have a headache nights?

Males are hardwired to spread their genes around. Its not evolutionarily normal for guys to have one sex partner for ever. So they masturbate to a fantasy rather than risk an affair.

Men jerk off daily. Happily married or not. Sexually satisfied by their spouse or not. Usually while watching porn. So yes 100% normal

Having sex and jerking off are two different things and aren't necessarily related. I think it is perfectly normal, I'm 57, and still jerk off to porn. The sex slows down and so does the number of times you Jack off. When you're younger, you probably have more sex, and you probably Jack off more. Don't worry about it. No biggie, but I if it turns you on, ask him to jack off in front of you, he may like it, and slip in there that you caught him and though it was so hot. You never know, it may lead to more sex. Masturbate at the same time.

he probably is not avoiding sex with you , its your pussy. over fourty the pussy changes due to hormones and it smells funky. nature does it to drive the fertile men into fucking younger fertile women. thats life . pussy changes at 13 as well so men dont waste seed on children. you knew this shit already i dont know why you would even ask.

Does he try to avoid having sex when you want to have sex with him? Or is it you've tried to avoid having sex with him when he's tried to have sex with you? Either one of those can explain him turning to internet porn, but the latter reason would not be because he doesn't want to have sex with you.