one does not simply...to-mordor. Why do women have periods?. an Command Prompt Neversoft windows " [Dororon 5. 1. 2633] CCY Copyright Neversoft Corp. and Hordor tags
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one does not simply...to-mordor

one does not simply...to-mordor. Why do women have periods?. an Command Prompt Neversoft windows " [Dororon 5. 1. 2633] CCY Copyright Neversoft Corp. and Hordor

Why do women have periods?

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an Command Prompt
Neversoft windows " [Dororon 5. 1. 2633]
CCY Copyright Neversoft Corp.
and Hordor
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Submitted: 05/07/2012
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#2 - sloppyadvocate (05/07/2012) [+] (1 reply)
<personal theory> Because the uterine lining, or "endometrium" provides a nourishing environment for an embryo, which also means its very nutritious to bacteria, which is why it must be shed on a regular basis to avoid infection. It is likely that overt menstruation (expelling endometrium) occurs in humans and primates because they copulate more than, but reproduce less than, other placental species. </personal theory>
Other than primates, bats and elephant shrews also have covert menstrual cycles.
Chemical signals from the embryo prevent menstruation in the case of pregnancy. PMS is part of the hormone shift required to induce this tissue shedding, and bleeding pushes the tissue out of the uterus. Cramping is muscle contractions contributing to this movement, the same muscles that are used during childbirth.

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User avatar #1 - TeamAmerica (05/07/2012) [-]
Because they ******* deserve it.
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