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A comment on Evolution’s Worst Mistake? How About External Testicles?. Parent comment

Re:Evolution’s Worst Mistake? How About External Testicles? by vanderZwan on Friday June 01, 2018 @01:43PM (#17207950)
Also, not all animals have periods:

https://www.quora.com/Why-do-women-have-periods-What-is-the-...

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