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1.
Similar to a lesbian scissor, but instead of involving a vagina rubbed against a partner's vagina, anal scissoring involves an anus rubbing against a partner's anus.
The beauty of the anal scissor is that two partners can engage in this filthy activity, whether they are two females, two males, or a male and a female together.

Jessica pooped into Peter's anus during a rough bout of anal scissoring.
by Ray Finkle-Einhorn April 28, 2008