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Lol one of the main purposes of the human body is to reproduce. Of course you are going to have a lot of periods if you not using the body for the intended use. And why wouldn't you want a fresh egg and lining monthly to try to make offspring. You want to use old ass eggs to make babies?
it's made for stone age society ...?

the real question is why god made some people stupid and some people smart.
that is the question no one has an answer to.