Why would he stop having sex with her?

Get out of this one and fast. He's milking you for what your worth. Why on earth are you with this guy? If it's for sex, I'm sure there's other men more deserving of it.

The fact that he has some drinking problems might become a problem. If anything you're helping him feed his habit of drinking by supporting him. He's a grown man so he should be footing half of the rent for real! girl, you crazy if you stay with this dude. if he's going a lot to 'drink' and doesn't come home till the next day I'm sure he's doing more than just drinking.

the fact that you want sex and he's holding out on you.he knows your weak spot and that's BAD NEWS! he's only going to use this against you by trying to come up with exchanges and compromise with you like if he has sex with you then you have to do something for him in return. what is this, a transaction? that's not how a real relationship should be. if anything, he should be greeting you at the door when you get home from work and have dinner ready.

I say kick this guy to the curb. NO guy this age just 'loses' their sex drive unless he's already exhausted from something else. sorry to say it but he doesn't deserve you. you should look elsewhere and forget him!

Well, it kinda sounds like he's using her from the fact that she supports him. And It seems that he's trying to keep the relationship "together" but it still sounds like he's only interested in being supported (financially, etc.) and nothing else. I think she should get rid of the guy, or at least sit down and have a talk with him. Because if she does want sex, then she should at least talk to him about it because a relationship is a give and take thing; both parties have to be involve. He could also possibly (maybe) be questioning his sexuality. Though, I'm not sure; I've never heard of a situation quite like this one. Just tell her to talk to him (a serious, undivided attention talk). Hope this helped!