In sex, the small head is dominate

Times:

Size does not matter when it comes to a sperm’s ability to reach and fertilise an egg, a study published today suggests.

Research in the London-based journal BMC Evolutionary Biology casts doubt on the common scientific belief that sperm with longer tails can swim faster. The speed at which a sperm swims is a key factor in its capability to fertilise an egg.

While a longer tail does mean more thrust, this can be cancelled out by the drag caused by a correspondingly larger head. The proportions of the sperm - and ratio of head size to tail length - is the key factor, the researchers found.

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I bet you thought I was talking about the sperm delivery system. Which reminds me of an old joke on why some men give a name to their penis--They don't want most of the major decisions in their life to be made by some one they are not on a first name basis with.

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