On Thu, 8 May 2003 21:56:15 +0000 (UTC), "Representative Trantis"
 wrote:

>A man produces sperm, some of which are genetically different from others he
>produces. After ejaculation, why don't the sperm act selfishly and compete
>for the egg?, instead some stay and fight off rival sperm!

They do!  There are many rivals to compete against. In fact, the
fathers genes compete against the mothers inside the zygote..
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