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That means, for most men, most of their sperm are funny looking," writes Dr. Take the sperm of the male diving beetle, which is seriously strange: Instead of swimming in the female reproductive tract on their own, individual sperm cells often stick together in pairs, in clusters and even in long chains of hundreds or thousands. Craig Niederberger on his male fertility blog called Male Health. Humans may have odd-looking sperm, but the prize for weird sex cells goes to the animal kingdom the non-human one. Researchers reported why DHA is so critical in October in the journal Biology of Reproduction; they found that DHA turns dysfunctional round-headed sperm into strong swimmers with cone-shaped heads packed with egg-opening proteins. A protein called catsper in sperm cells is responsible for recieving the hormonal signal, researchers reported in in the journal Nature. Read on for 7 surprising facts about sperm. Women tend to be attracted to men with deep, manly voices. Department of Energy's Lawrence Berkeley National Laboratory found that men over 44 with high vitamin-C diets had 20 percent less DNA damage to sperm than their peers who consumed the least vitamin C.

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