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Finger up the butt is a colloquial term for digital penetration of the anus. This sex act may be a component of the interaction between a sex worker and his or her clients, or of the sexual interaction between intimate couples.
Finger up the butt is often referred to by the acronym FUTB, particularly in the advertisements of sex workers and in client field reports.
Many men enjoy a finger up the butt because it stimulates their prostate. This gland is very sensitive and responds well to firm but gentle massage. It’s possible for men to climax from prostate massage alone.
Unlike the vagina, the anus does not have any natural lubricant. For this reason, a finger up the butt typically feels more pleasurable when the finger is coated in lubricant. As with any activity involving the anus, digital penetration does carry a risk of spreading infections or diseases. This risk can be reduced if the person penetrating the anus wears a latex glove. This glove can also feel wonderful against the delicate tissue of the anus. A condom over the finger will also work well. If neither of these are available, the finger should be clean, as should the anal region.