送交者: Enlighten 于 2005-1-16, 23:28:14:

回答: Science: Ten things we will know this time next year [zt] 由 hehe 于 2005-1-16, 21:52:18:

It is well known that although it's not necessary to conception, the contraction of female anatomy makes it easier for the sperms to travel to the uterus. Also it can trigger ovulation in some cases. As a result, the male who can better please a female has a greater chance for passing his genes.
The criterion is not whether it is "necessary", but whether it is "more advantageous", or "better" for conception and survival.

• When human started to walk upright, his pelvis became narrower - hehe (84 bytes) 2005-1-17, 04:22:52
• You mean the contraction of the female vagina? - hehe (74 bytes) 2005-1-16, 23:43:19
  • Not just the vagina, but also the uterus, and the cervix - Enlighten (325 bytes) 2005-1-17, 00:41:39
    • Thanks - hehe (0 bytes) 2005-1-17, 03:13:21

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