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In page Anal sex:

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Research indicates that anal sex occurs significantly less frequently than other sexual behaviors,[4] but its association with dominance and submission, as well as taboo, makes it an appealing stimulus to people of all sexual orientations.[3][5][6] In addition to sexual penetration by the penis, people may use sex toys such as a dildo, a butt plug or anal beads, engage in anal fingering, anilingus, pegging, anal masturbation, figging or fisting for anal sexual activity, and different sex positions may also be included.[3][7] Fisting is the least practiced of the activities,[citation needed] partly because it is uncommon that people can relax enough to accommodate an object as big as a fist being inserted into the anus.[3]