sex in the library between stacks of books.
Chris and Kelley were looking for something kinky, so they decided to have sex in the stacks.
by bsmaster December 28, 2009
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A position in a threesome where a guy is on the bottom fucking a guy who is simultaneously fucking someone else
Last Night, Harvey, Amy, and I were in a sex stack.
by Bozzzzz October 6, 2023
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