Should it be legal or is it absurd?
I don't know enough specifics on your situation to form any kind of judgment, but nobody owes anybody else sex. Nothing would turn me off about wanting to have sex faster than my partner expressing an opinion that he's somehow entitled to it from me. And there are very few things that will quash the female libido faster and more permanently than resentment, so there's also that.
I would think that before no-fault divorce laws that it would have been grounds for divorce. But, of course it should be legal. What the hell are you even asking? Should a spouse/partner be forced to have sex against their will? That's rape. Either come to a compromise on an open marriage or get divorced.
After reading some of the other comments that mention inmates in prison, I've changed my vote to undecided. You really need to be more specific if you want a valid vote count.
Your ? is vague and ambiguous. What do you mean, are you talking about a partner in a marriage or committed relationship refusing to have sex with someone? Or are you talking about any person who is deprived of sex with someone other than themselves for 14 years, such as an incel? Or, as someone below mentioned, are you talking about imprisonment by the government or corrections system, where the prisoner is not allowed to have sex with someone that is not another prisoner, such as being allowed conjugal visits to have sex with people outside the prison who are living in the free world? You need to be more clear and specific if you are serious about posing the ?
Let's say it does. Since this isn't in the lots of laughs category, I'm assuming you're serious. Consequently it would violate the Constitution and would give you a right to sue...who?
The government? Do you actually blame the government for not providing you sex? Pretty sure prostitution's legal in Nevada. So you could go there. If you're in prison, I'm pretty sure we all know sex is possible if you let it happen, just might not be the kind you've dreamed of. If it's a marital problem that's why god, yes god, invented divorce. Ha ha
No one is entitled to sex.
I've not had sex in a whole decade now. During the last three years of my wife's life she was too ill to give me sexual relations. At no time did I consider it her duty to fulfill my needs.
Now, if the withdrawal of sex is being used as a punishment, then that is a matter for relationship counseling.