Speaking as a man, I would never marry but what do we want from a long term relationship? In the most abstract terms it would be ‘An arrangement of mutual benefit’. I don’t think this is any different to what women want.
I think most people have an intrinsic sense of the concept of fairness, they expect a sort of equality in what they give and what they get from a relationship. The ‘gives’ and ‘gets’ can take many forms and the perceived value of each is entirely individual. The important thing is that both sides feel they are getting acceptable ‘value’ for their own contribution and that the ‘deal’ is a net positive for them. This is why we see all kinds of successful relationships, from the Bernie Ecclestone style sugar daddy/trophy wife arrangements, the stay at home dad and high-flying professional wife, the male provider and the housewife, the attractive and chubster couples, spotless houses, disaster zone houses etc. All these arrangements clearly work for them as a whole.
The problems tend to occur when the participants have a difference in their perception of the ‘cost’ or ‘value’ of different aspects of the relationship, often when changes in the relationship ‘deal’ occur. If one party feels they are now getting less out of the relationship they will feel obliged to put less in, this can precipitate a mutual spiral until one or both participants feels the relationship to be no longer of benefit. In basic terms things that are a big deal for one party and the other doesn’t realise or can’t accept why, be they weight/fitness/appearance, intimacy, housework, children or whatever. The only way to resolve these perceptions is open communication and negotiation.
So there is no single answer to ‘what men want’, nor even to what any individual man will settle for.