I agree with much of what Cheesebuster said however I think many people missed the point of Cheese's post, which was, in summary:
- some people do just have low sex drives.
- He should though be willing to compromise with you. Could you suggest once a month as a starting point? And gradually up it to once a week.
- Also very surprised to see a husband be called controlling for not wanting his wife to have affairs!
The OP's husband (or other people who have a low sex drive) are not trying to enforce celibacy on anyone, they simply are choosing not to have sex as often as someone else wants, which is their right. To be pedantic, people are getting off topic in this thread quite a bit. The OP is not in enforced celibacy, they have sex, just not as much as the OP would like.
Many people are referring to a low sex drive as a "problem". As the OP said, her husband doesn't think he has a "problem" so referring to his low sex drive as such only serves to shame him into think he's not normal. Such pressure to perform hardly helps his feelings on the matter I'm sure.
The OP should instead focus on herself and how it makes her feel. She is not happy with the situation, THAT is the problem. So yes, he should be willing to discuss the actual problem, which is the mismatch of sex drive and whether this really is a deal breaker for her.
As for the references to a "marriage contract"... I didn't take a vow to have sex with my husband. It wasn't part of my "marriage contract" at all. Happiness was though. So I will agree that the fact this is deeply distressing to the OP is important. HOWEVER, by asking for more sex or you want an open relationship, or you might have affairs, is emotionally manipulative in my opinion, and you should be aware that you would in effect be emotionally blackmailing your SO into having sex.