If you need to go to this level of extreme decisions, i think the marriage was lost, way before this movement even existed.So you consider breaking up a marriage or a life long commitment is valid because your partner won’t vote for the same political party as you as not bullying, because I hate to break it to you but a relationship without sex in a marriage or serious relationship almost always leads to divorce and separation.
It will make a lot of SP happy and keep them working though.
I do agree that a woman who will use these kind of tactics is not someone you should entertain being with and you should run like hell as quickly as possible.
And yes if you despise your partner to stop having sex with him/her, it's a valid reason for divorce.