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Pegging, sometimes also known as bend over boyfriend or BOB.
It is a sexual practice and type of heterosexual anal sex in which a woman penetrates her partner's anus with a finger, dildo, or strap-on dildo.
This technique requires the use of a lubricant. The anus is not naturally lubricated, unlike the vagina.
The procedure is no different from anal sex, the only difference is who is the passive participant and who plays the active role (in pegging, the woman).