A guy has a recovery time that a woman does not have. A woman can have orgasm after orgasm (that's just not fair!!) but a guy must wait a period of time before he can cum again. If it is once in the morning and once at night it can happen but for some men that is even difficult. So while he might have been doing that, it may not have been all that easy. What I do is bring my wife to orgasm orally, with my fingers, or with a vibrator them have mine with her later...or right away. That might be something you guys can do. My wife does not have as strong a sex drive as you, but I would give her as many orgasms as she wanted any time she wanted it.
I must say, though, I don't understand why a guy would get off to porn when he has someone like you around. As you can see, we just had a thread that went on ad nauseum about the subject. Although, he may not be getting off, just looking. Now that I think about it, I don't know how he would have anything left to get off as much sex as you are having. So (as you can tell I am thinking while I am typing) I would say it is probably that he just has a hard time cumming that often.
The marriage bed must be a place of mutuality—the husband seeking to satisfy his wife, the wife seeking to satisfy her husband. Marriage is not a place to "stand up for your rights." Marriage is a decision to serve the other, whether in bed or out. -- 1 Corinthians 7 (The Message)