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see... gront the caveman was not like the others... for some reason he like gort, the chief, rather than lucy the babe of the tribe. gront, one night got an erection looking at gort, and gort noticed and got one too... and then they had sex.
homosexuality!

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hahaha I knew that's how it was started! Thanks for sharing that valuable information  

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Both optimists and pessimists contribute to the society.
The optimist invents the airplane, the pessimist the parachute.