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Credit: Jezper, Shutterstock Macho men may not have super-sperm. Women tend naked with chimps to be attracted to men with deep, manly voices. But research published hentai lesbian pics download in Dec. 2012 in the journal PLos ONE finds that these macho guys have no better sperm quality than gentlemen with high-pitched.
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Credit: Dawn Higginson, University of Arizona. Animals have you beat Humans may have odd-looking sperm, but the prize for weird sex cells goes to the animal kingdom (the non-human one). Take the male diving beetle whose sperm, rather than going it alone, travel in pairs.