Do all mammals do that?! Nah, just humans. Its an evolutionary response to ensure the zygote has a better chance of implantation reducing the rate of miscarriage, other species dont build up a utrine lining until the zygote has already become implanted so they have no need to expel it either" * accepting nods from the aliens* *horrified look from the other humans* "How do you even know that!"
For my second cake day, I present you. Some of my favorite story's of Humans are weird. - Humans post
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