It hurts them because their insides get moved so when you do it you're killing them so don't have sex ever unless you wanna be a killer.
English
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I'm surprised these people didn't understand your joke.
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¯\_(ツ)_/¯
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I don't think it works like that.
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What the -blam!- kinda gay ass teacher taught you that
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Uhmmm.... Ohkay that was not so unnatural at all
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Well my bad sir.