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back·ti·vi·ty \bak-'ti-vi-tē\ n, pl -ties (2011) 1: The quality or state of being sexually active/experimental with a view from the rear. 2: Vigorous or energetic action from the rear. 3: A similar process actually or potentially involving sexual function from behind. 4: An educational procedure designed to stimulate sexually (specific: Anal, Doggy, Reverse Cowgirl, blowing your load on her ass/back).
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