I completely understand the man who sent this e-mail: "Why Couples Turn Down Sex". What he called "mercy sex", I call disinterested sex. Either way a man finds it to be nearly impossible to ready himself when the other party isn't interested. Afterwards he feels a loathing impossible to describe. No sex at all is better than sex with a spouse disinterested. A man feels he is a failure and not fully satisfied, further compounding the problem. It is no wonder the man is willing to turn down sex knowing how he will feel afterwards.
Ronald