Human anus

anusanalanal areaanal sphincteranal-sphincteranallyanibunghole!perianal
The human anus (from Latin anus meaning "ring", "circle") is the external opening of the rectum.wikipedia
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Anal sex

analanal intercourseanal penetration
With anal sex, the anus can play a role in sexuality.
Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure.

Perineum

perinealperineal bodyanogenital
It is located behind the perineum which is located behind the vagina or scrotum.
It is a diamond-shaped area that includes the anus and, in females, the vagina.

Gastrointestinal tract

intestinegastrointestinaldigestive tract
The anus is the final component of the gastrointestinal tract, and directly continues from the rectum.
The GI tract includes all structures between the mouth and the anus, forming a continuous passageway that includes the main organs of digestion, namely, the stomach, small intestine, and large intestine.

Anal cancer

analanusanus neoplasms
Anal cancer is a cancer which arises from the anus, the distal opening of the gastrointestinal tract.

Sphincter

sphincterssphincter muscle
Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus.

Vagina

birth canalvaginalvaginal opening
It is located behind the perineum which is located behind the vagina or scrotum.
The laceration can be so extensive as to involve the rectum and anus.

Anilingus

analingusrimminganal–oral sex
Pleasure from the anus can also be achieved through anal masturbation, fingering, facesitting, anilingus, and other penetrative and non-penetrative acts.
Anilingus (from the Latin anus + -lingus, from lingere, "to lick", variantly spelled "analingus", ) is the oral and anal sex act in which a person stimulates the anus of another by using the mouth, including lips, tongue, or teeth.

Fingering (sexual act)

fingeringdigital penetrationfinger
Pleasure from the anus can also be achieved through anal masturbation, fingering, facesitting, anilingus, and other penetrative and non-penetrative acts.
Fingering may also include the use of fingers to sexually stimulate the anus.

Toilet paper

toilet rolltoilet tissuelavatory paper
A rinse with water from a bidet or a wipe with toilet paper is often used for this purpose, though anal cleansing practices vary greatly between cultures.
Toilet paper, sometimes called toilet tissue in Britain, is a tissue paper product primarily used to clean the anus and surrounding area of fecal material after defecation and to clean the perineal area of urine after urination or other bodily fluid releases.

Erogenous zone

erogenous zoneserogenousErogenic Zones
The anus has a relatively high concentration of nerve endings and can be an erogenous zone, which can make anal intercourse pleasurable if performed properly.
The prostate gland may be stimulated from inside the rectum, such as by anal sex, or by applying pressure on the base of the perineum near the anus.

Constipation

constipatedobstipationchronic constipation
Constipation has a number of structural (mechanical, morphological, anatomical) causes, namely through creating space-occupying lesions within the colon that stop the passage of stool, such as colorectal cancer, strictures, rectocoles, anal sphincter damage or malformation and post-surgical changes.

Bidet

Porcelain Bidet
A rinse with water from a bidet or a wipe with toilet paper is often used for this purpose, though anal cleansing practices vary greatly between cultures.
A bidet ( or ) is a plumbing fixture or type of sink intended for washing the genitalia, perineum, inner buttocks, and anus of the human body.

Buttocks

buttockassarse
The masses of the gluteus maximus muscle are separated by an intermediate intergluteal cleft or "crack" in which the anus is situated.

Non-penetrative sex

mutual masturbationdry humpingdry hump
Pleasure from the anus can also be achieved through anal masturbation, fingering, facesitting, anilingus, and other penetrative and non-penetrative acts.
Sexual stimulation of the genitals by using the feet may also be included, and so may manual stimulation of the anus.

Anal piercing

anal
True anal piercing is rare because it may interfere with the function of the anus.
An anal piercing is a body piercing in the surrounding area of the human anus, usually the perineum.

Latin

Latin languageLat.la
The human anus (from Latin anus meaning "ring", "circle") is the external opening of the rectum.

Rectum

rectalrectallyrectal ampulla
The anus is the final component of the gastrointestinal tract, and directly continues from the rectum. The human anus (from Latin anus meaning "ring", "circle") is the external opening of the rectum.

Feces

faecesdungexcrement
Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus.

Defecation

defecatedefecatingbowel movement
Two sphincters control the exit of feces from the body during an act of defecation, which is the primary function of the anus.

Internal anal sphincter

internalSphincter ani internusanal sphincter
These are the internal anal sphincter and the external anal sphincter, which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning.

External anal sphincter

anal sphincterSphincter ani externus muscleSphincter ani externus
These are the internal anal sphincter and the external anal sphincter, which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning.

Muscle

musclesmuscularmusculature
These are the internal anal sphincter and the external anal sphincter, which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning.

Scrotum

scrotalscrotal skinprescrotal
It is located behind the perineum which is located behind the vagina or scrotum.

Human sexuality

sexualitysexualsex
With anal sex, the anus can play a role in sexuality.

Taboo

taboossexual tabooimpolite
The anus is often considered a taboo part of the body, and is known by many usually vulgar slang terms.