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It's not the fact that men masturbate, but the fact that the public discourse regarding the masturbating man is so arch, and coy, and full of induced aversion to homosexual imputations. This presumably is why the advertising agencies so loved the Salon.com treatment of 'the metrosexual'. Such a man is so easily manipulated by his own shame, it's almost his own fault. I recommend Austin Spare's "Book of Pleasure, or Self-Love" as an antidote. It's completely free!
http://www.hermetic.com/spare/pleasure.html