Pegging
From Wipipedia
Pegging refers to a woman using a strap-on dildo to penetrate a man's anus, and may sometimes be used for female-female strap-on anal sex. The term gained wide currency through its use by sex advice columnist Dan Savage, who held a contest in his column to come up with an appropriate name for this act. Another candidate was "bobbing", referring to the Bend Over Boyfriend videos. [1]
Some females who wish to perform anal sex but dislike the idea of a strap-on dildo use their fingers instead.
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