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Well...
I have to say, science can explain so many things... Its a little mad. And if I'm honest, I never really understood how bottom gays can enjoy it up the bum. And now I know. Its all to do with the prostate gland. Apparently, just "tickling" it can make you have an orgasm. You have to look it up to fully understand it. But it is rather self explainitery. Anyway, though i might as well share facts about this funky parts in the male body.