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You may never get to be a superhero and smash your way through buildings like the Incredible Hulk, but there's at least a chance your sperm will. (OK, so that's not actually a good thing, but at least "super-sperm" sounds cool.)

Women's bodies are designed to make life difficult for sperm. According to Dr Hasson, of Tel Aviv University in Israel, "They eject, dilute, divert and kill spermatozoa so that only about a single spermatozoon gets into the vicinity of a viable egg at the right time." Apparently after generations of this, sperm got fed up and started hitting the gym.

According to an evolutionary biologist, some men are producing sperm that is so strong and so fast they barrel past the female's defenses in their effort to fertilize the egg, allowing multiple sperm to hit the target. If you recall your birds and your bees correctly, in order for fertilization to work, only one sperm can fertilize the egg. When several hit home it's called polyspermy (heh) and the egg ends up ruined.

This has, in turn, led to a rise in levels of infertility, at least according to Dr. Hasson's theory. The solution to the problem is apparently just to wait it out, as women's bodies evolve in kind, presumably by producing some manner of ovarian Kryptonite.

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