well...ah...yes you are just being stupid.
But don't take that the wrong way. LOTS OF WOMEN play the fool, you're in good company. Listen, I just come out guns a blaz'in because I want women like you, fine, good, sexy, passionate, smart (at most things)...women exactly like you that kid themselves into thinking their guy would never do this, that or the other thing. He's doing it. Clarification...he's doing her. Guys typically don't want sex with their wives because they're having it with another woman. I'm a guy, I know these things, sweetheart. You need to hear this. Stop settling for a guy that cheats, shaves his dick, and gets it on with another. UNLESS, you can handle loving a guy...a guy that cheats. Some woman can separate the two. Sounds like the "no sex clause" in his marital vows irks you mightily. It would me, too. You've got to really think long and hard (pardon the pun) about your marriage, and this guy you have made a life with. I can see both sides...
Face forward, eyes wide open...it's time for you to take a bite of the apple and instantly realize that you are married to a a cheating husband. There, I said it for you, you don't have to pretend any more. Now, shake the cobwebs out and really search inside for all the positives this guy gives you vs. the negatives. I know many women who could give a damn about the sex because the money, the lifestyle, all the rest of the stuff he delivers is a good trade-off. Is this you? Only you can answer that one.
If sex is big for you, and I'm leaning that way by the post you wrote...either you get really acquainted to your vibrator, cheat behind his back, or...what? Is there a third option I don't know about? He won't change...guys that age who are getting ass on the side really never change. Balls in your court, whatcha gonna do?