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Hmm, could that be because they're having sex not out of desire, but out of a feeling of obligation? Stop the presses!! You mean that maybe, just maybe, this means that it's not their bodies or brains that are the problem, but their socialization and/or powerlessness in a relationship? Or...gasp...the (un)desirability of their partner? No, that couldn't be right...
Sounds like the same problem most of the married men in my neighborhood have. I guess this isn't so uniquely a feminine problem.