Masturbation focusing on the anal area. For humans, common methods of anal masturbation include the insertion of fingers or sex toys such as butt plugs . Studies have shown that anal masturbation is common in many species.
Anal masturbation can be pleasurable for both men and women, both heterosexual and homosexual . The anus contains an abundance of erotically pleasurable nerve endings. For men, anal masturbation can be especially pleasurable because it often stimulates the prostate , which also contains an abundance of nerve endings. For women, insertion of an object into the anus can indirectly stimulate the vagina . Since the muscles of the anus contract during orgasm , the presence of an object holding the sphincter open can strengthen the sensation of the contractions and intensify orgasm for both men and women.
It is often necessary to apply lubricant to the anal area before insertion of any object, since unlike the vagina, the anus does not produce natural lubrication.