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By his own account, he and his wife enjoyed sex together while they were dating. He says she stopped having sex with him on their honeymoon and since then she has been unwilling to service him sexually unless he rewards her. Although LW's letter (and several Salon posters' letters) portray LW's wife as a manipulative shrew and LW as Mr. Innocent, I seriously doubt that's the entire truth.
I think it's more likely there was a serious falling out between them during the course of their wedding -- a falling out that they have not resolved. More than likely, LW did something back then to alienate his wife, and they've been immersed in their games ever since. They both sound like emotionally dishonest people. My hope is for them to stay together so they don't infect innocent bystanders with their brand of nastiness.
If sex is pleasurable to women, they don't just quit unless something has stopped working for them. Usually it's because there's a problem in the relationship and they have become too angry with their partners to feel pleasure with them. I believe there's more going on than LW shared with Cary, and it has to do with some bad behavior on his part.
Bully for LW, he's now found an actual chemical weapon to use against his wife. Perhaps he can use increasingly strong medications to continue to subvert his sex drive; that'll really show her.
I'd say I wish them the best but actually I don't.