Fault divorce makes you prove that harm is being done thus a divorce is needed. This is removing no sex as a fault. I think there are usually financial ramifications from being the at fault spouse. Thus there would be financial repercussions for refusing to have sex with someone. Obviously a bad thing.

There is a thing called no-fault divorce that requires no proof of harm. I don’t know if France has this, but it is how you get around needing any reason besides that one spouse wants to.