The human anus is situated between the buttocks, posterior to the perineum. It has two anal sphincters, one internal, the other external. These hold the anus closed until time to defecate. The inner sphincter consists of smooth muscle and its action is involuntary; the outer consists of striated muscle and its action is voluntary.
Role in defecation
When the rectum is full the increase in intrarectal pressure forces the walls of the anal canal apart allowing the fecal matter to enter the canal. The rectum shortens as material is forced into the anal canal and peristaltic waves propel the feces out of the rectum. The internal and external sphincters of the anus allow the feces to be passed by muscles pulling the anus up over the exiting feces.
Role in sexuality
The anus has a relatively high concentration of nerve endings and is an erogenous zone. Sigmund Freud’s theory of psychosexual development, for example, described an anal stage, hypothesizing that toddlers derive pleasure from retaining and expelling feces. This is the source of the derogatory term anal-retentive.
Anal intercourse can be pleasurable for both the insertive partner and the receptive partner. For females, pleasure from anal intercourse is also thought to be related to the shared wall between the rectum and the vagina as well as the G-spot. For males, the tightness of the anus is often said to be a source of pleasure in penetrative anal sex, while the presence of the prostate gland near the rectal wall is generally seen as a source of pleasure during receptive anal intercourse.
Anal intercourse, sometimes referred to as sodomy or buggery, is a common human sexual activity, but is considered taboo in a number of moral systems, and it has been, and in some jurisdictions continues to be, a crime carrying severe punishment. Breakin’ the law breakin’ the law!
Anal sex need not include penetration. The anus also plays an important role in face sitting, coprophilia and anilingus.
Anal stretching can stimulate the nerves around the anus and can be considered pleasurable. Care must be taken to maintain elasticity. Anal stretching is a practice used by some to train relaxation of the muscles of the anus. While some sources indicate that it has medical benefits, it is more commonly employed as training to more easily perform various forms of receptive anal sex. Users of these techniques include those involved in graphic pornography. The most common method is the use of butt plugs. This practice is often referred to an anal dilation or anal training.
Care should be taken if attempting anal stretching because increasing the circumference of the sphincter muscle while decreasing its elasticity can lead to fecal incontinence. To minimize this risk, one must preserve the elasticity of the sphincter muscle. This is accomplished by proceeding very gradually – i.e. by inserting very small objects at first, and then over a period of months (or even years), very gradually increasing the size of objects that are inserted. Objects should also not be left in the anus for long periods of time as this will also decrease the elasticity of the sphincter. Any pain is a sign that one is proceeding incorrectly and should proceed more gradually.
See my blog for Keegle Exercises.
Water Enemas most commonly used or
Dry Enema See my blog for more information.
It is accomplished by introducing a small amount of sterile lubricant into the rectum, resulting in a bowel movement more quickly and with less violence than can be achieved by an oral laxative.
It is called “dry” by contrast to the more usual wet enema, because no water is used.
A quicker form of the dry enema utilizes the injection of a small amount of water-based lubricant such as K-Y into the rectum via a non-hypodermic syringe, such as an oral syringe – freely obtainable in most drugstores, or from some other source (see illustration).
The usual amount of lubricant applied is about 2 tsp. (10 CC), which will produce a movement in 30 minutes or less. The movement will be produced in a compact body, rather than in the more copious liquid form produced by a wet enema; and since no water is used, none will be retained higher up in the colon, to be expelled at some later, and presumably, inconvenient time.
A further advantage of this technique for sexual-hygienic purposes, is that any slight remaining traces of fecal material will – due to the presence of the lubricant – tend to adhere to the wall of the rectum rather than to any foreign object which may subsequently be inserted.
Anal masturbation can be pleasurable for men and women of any sexual orientation, as the anus contains many sensitive nerve endings. For men, anal masturbation can be especially pleasurable because it often stimulates the prostate, which also contains sensitive nerve endings. Indeed, some butt plugs for men are specifically shaped for prostate stimulation. 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.
Enemas or anal douches are, for hygienic reasons, often taken prior to anal masturbation, but they can also be a form of anal masturbation themselves. Using enemas too frequently can lead to a physical dependence on them in order to have a bowel movement, however.
Since the anus does not produce natural lubrication, it is often necessary to apply lubricant to the anal area before insertion of any object.
Commonly inserted objects include butt plugs, anal beads and phallic vegetables.
Prostate massage involves massaging the prostate (one source of sexual pleasure in men relating to orgasm and in this context, colloquially called the A-spot or peace place) through the anus by finger(s), or with a vibrator, or with a penis or strap-on dildo during anal sex. The prostate can also be indirectly massaged externally through the perineum.
Prostate massage (also known as prostate milking) is sometimes carried out as a medical procedure for the treatment of prostatitis, although its benefits have been debated in the medical community and it is highly inadvisable for patients with acute prostatitis (as opposed to chronic cases), for whom the infection can spread elsewhere in the body if massage is performed. Done internally either by finger(s) or an instrument, prostate massage is pleasurable to both gay and straight men and may result in orgasm without any genital stimulation. The intensity of the orgasm and the amount of ejaculate may be significantly increased in some cases.
Prostate milking refers to the sexual practice of relieving the buildup of semen by regular prostate massage, thus preventing the need for ejaculation at other times. It may be used clinically in the treatment of prostatitis, or more commonly as part of BDSM activities, such as games involving the erotic use of sexual denial. It only applies to a male submissive, females not having this type of sexual anatomy.
The release felt by a man as a result of prostatic milking against a background of denial, is described as long, drawn out, but not reaching a resolution phase as with normal orgasm. It is therefore said to always leave an edge of not having had full satisfaction, or a yearning for more, as opposed to the “drop” in responsiveness due to satiation after a full orgasm. For people who engage in lifestyle chastity and erotic denial, this may be desirable, since after orgasm a male is sated and released for some days of the tension which builds up with orgasm denial.
Some practitioners, seeking to prevent even this reduced degree of pleasure, apply crushed ice around the penis and testicles for some minutes before, and during, the massage, ensuring that the male is unable to feel the milking genitally and therefore denying even that pleasure. It is suggested by such practitioners that the male is fully tied up first, as it may be hard to apply ice to the genitals and keep them still, otherwise.
As a side note, part of the mechanism for orgasm for a male involves the accumulation of fluids within the prostate and associated ducts; accordingly once milked, a male will be incapable of achieving orgasm regardless of the degree of stimulation, for some time after.
The term also refers to a non-sexual medical procedure involving similar prostate massage for the purpose of relieving prostatitis.
Monday, May 18, 2009