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Aliens created us. But who created aliens? There parents of course.

What? Thought only humans have intercourse. Well be prepared for a health lesson on how Aliens give birth to each other.

Aliens are very perplexed and complicated creatures, but only to us - to them having five penises and sticking it in the asshole isn't bad. Slowly they fuck, and once the 'male' is done the female releases a acid that leaves traces of it's Dna in the male's penis which flows towards his guy ovaries and he gives birth to the future offspring.

The end.