When we approach our partner for sex, we are putting ourselves in a very vulnerable position. When those advances are spurned, people with poor self esteem or those who feel insecure in their relationship, can often take the rejection very personally. It is wounded pride. Some people don't have the resilience to be able to brush that off and carry on, some people do not have the ability to be able to handle that very well.
Neil's wife and Marion's husband, both fall into that category. I don't see it as particularly abusive (though Neil's DW's reaction was quite extreme). If they felt better about themselves, then the sulking would probably stop.
I think they need a bit of an ego boost to soften the blow of the rejection. Everyone has the right to say no, but you can be considerate in how you deliver that no, that recognises the vulnerability of their partner's position.
Communication is so important in relationships, particularly when it comes to sex. So many misunderstandings could be avoided if people just learned to talk calmly, without accusations and blame getting thrown about.
Marion, I would tell him that you love, adore and fancy him, you love having sex with him, but sometimes, it just doesn't feel right. You are not rejecting him, you just don't feel right at that moment. Tell him that you have noticed that he seems to feel quite hurt when you do say no, and that is quite difficult for you to deal with, because you don't want to hurt him, but does he want you to have sex when you don't want to, just because he might feel hurt if you say no?
Replacing the word "sulk", with "hurt", will come across better in a conversation.
And how many people have "abused" their partner, by not talking to them when they have hurt their feelings?