I also enjoy the post earlier on this thread with the same idea but the roles reversed - the wife who's lost her attraction for her theoretical husband.

"there is more to my love for him than sex"

No, there's not. The health of any relationship is defined by the bedroom. If a relationship is a plane, sex is the fuel.

This is true regardless of gender.

Note the gratuitous self-justification in logic: It's OK if the woman doesn't want to have sex (even though sex is the only way males experience romantic closeness) because "there's other things to the relationship" - but when it's the woman being rejected, the man's all wrong.

The first thing regarding "who's to blame" is this. Fighting fair is key to success of any relationship. Both people are to blame, and both should HUMBLY take their own measures if repair is actually the goal. If the goal is simply to point fingers and not do anything, the relationship's dead.

Fat person: Lose the weight. Eat right. Work out. Don't like it? Tough. Get over yourself. In all phases of life, there are things you don't want to do. This is one of them.

Skinny person: Remember why you liked them years ago. Help them work out - and take them to therapy if that's needed. Don't beat 'em up.. but don't let 'em lay around feeling sorry and making excuses why they do nothing because it's easier.

Obesity is simply not acceptable. It is an epidemic, with readily observable consequences. Don't tell yourself how your genes "predestine" you to a life of fatness.. your sedentary existence of Happy Meals, Xbox, and friends who goad you into shopping at Lane Bryant while reminiscing about how hot you were 15 years ago is what guarantees it, and FAR outweighs all genetic contribution.