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When you have any sex with a corpse, or someone dead.
Bryan found a dead girl in his room, and he proceeded to have dead sex with her!
by DinoCoat March 30, 2017
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The type of sex that offers no pleasure, and in the case of men, causes the penis to lose all stiffness, and in the case of women, causes them to no longer be interested in having intercourse with men.
95% of gays in the United States occur due to dead sex.

My penis became totally floppy because my girlfriend and I had dead sex.
by Brooks Wagstaff February 15, 2008
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