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We've always wondered how a schlubby guy like Jimmy Wales sees so much action. It can't be the I-founded-Wikipedia-can-I-edit-your-page pickup lines — for every Rachel Marsden he lands with those, one thinks Wales would get 10 drinks in the face. At last, we've gotten a scientific explanation: It's the stubble. A recent study found women prefer mates with stubbly cheeks to smooth faces or full beards. (Thank you, Don Johnson.) And according to Wales's comprehensive compendium of facial hair stylings, Wales himself is the iconic paragon of stubble. (Photo by EvgenyGenkin)