There is a fine difference between agreeing to do something as a personal sacrifice and being obliged to do so.
Yes, it is reasonable to expect some level of sacrifice. That it is given voluntarily is part of making a relationship work well. But just that being unwilling to make certain sacrifices would put a strain on the relationship does not in turn imply an absolute obligation to them.
> How long would a relationship last of one person started refusing to talk to the other person, at moments seemingly for no reason to the other person? How long would that last?
Having been privy to a (non-amorous) relationship in which exactly this happened, I can tell you that trying to obligate the non-communicative side to communication is exactly the wrong thing to do. That doesn't mean that the relationship is over, but it does mean that there is a grave problem. Solving that problem is the way forward, not insisting on some "moral obligation".
> If you are refusing sex for no good reason
I'm a bit confused what you consider "good reasons". Do I need a "good reason" for not wanting to dance? Or for not wanting to go to the pool? Is it necessary that I communicate my entire mental state in a way that makes the decision retraceable for you, or do you trust me when I say that I really don't feel like it? Or is it only physical incapability that counts?
Yes, it is reasonable to expect some level of sacrifice. That it is given voluntarily is part of making a relationship work well. But just that being unwilling to make certain sacrifices would put a strain on the relationship does not in turn imply an absolute obligation to them.
> How long would a relationship last of one person started refusing to talk to the other person, at moments seemingly for no reason to the other person? How long would that last?
Having been privy to a (non-amorous) relationship in which exactly this happened, I can tell you that trying to obligate the non-communicative side to communication is exactly the wrong thing to do. That doesn't mean that the relationship is over, but it does mean that there is a grave problem. Solving that problem is the way forward, not insisting on some "moral obligation".
> If you are refusing sex for no good reason
I'm a bit confused what you consider "good reasons". Do I need a "good reason" for not wanting to dance? Or for not wanting to go to the pool? Is it necessary that I communicate my entire mental state in a way that makes the decision retraceable for you, or do you trust me when I say that I really don't feel like it? Or is it only physical incapability that counts?