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Smex is the kind of sex you read or watch when looking at or reading any kind of japanese cartoon. Is also used when read yaoi/yuri. Mostly used when reading yaoi/yuri, actually. "Smexy", a word favored by fangirls/boys everywhere, is used to describe any character he/she would like to throw down and screw their brains out...no matter who the character is really SUPPOSED to be with. For instance:
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