Anal masturbation is autoeroticism focusing on the anal area. For humans, common methods of anal masturbation include the insertion of fingers or sex toys such as butt plugs or anal beads. Stimulation with one or more fingers is most common.
Enemas or anal douches are, for hygenic reasons, often taken prior to anal masturbation, but they can also be a form of anal masturbation themselves: see klismaphilia. 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 important to apply lubricant to the anal area before insertion of any object. Many people report that they have tried anal insertion, whether by a toy or a penis, but have not repeated the experience due to painful sensations; these sensations were most likely induced by the lack of the usage of a lubricant. In order to increase the chances of pleasant and pain-free insertion, it is important to understand that at rest, the muscles of the sphincter are contracted (clenched) for the retention of waste, so in order to receive a foreign object, it is useful to push outward as if defecating. This opens the sphincter and allows for much easier and pain free insertion. At first it may feel strange to do this in a non-defecation context, but providing that the rectum is empty of waste this will not result in any undesired or unexpected expulsion of fecal matter, so one can push without fear. The feeling of wanton abandon and dirtiness in pushing outward in this manner has been reported to be an important aid in the enjoyment of anal sex or anal masturbation. Whether new or experienced, the importance of lubrication cannot be over stated. The initial insertion should take place very slowly and gradually to allow the muscles time to adjust to the introduction and presence of a foreign object.
Commonly inserted objects include butt plugs, anal beads and phallic vegetables.
Prolonged or heavy bleeding is a different matter. This is a serious situation that can become life-threatening if left untreated. The injury may turn out to be more severe than was first suspected (especially if there was no sensation of pain when the injury occurred). A wound that penetrates the intestinal wall is likely to lead to feces passing into the peritoneal cavity, leading in turn to peritonitis (inflammation of the lining of the abdomen). This is a potentially fatal condition that must be treated as soon as possible. However, anal play using objects that have no sharp edges or rough surfaces is unlikely to cause this kind of injury.
A significant risk factor associated with any injury that causes bleeding is the effect of certain drugs that cause thinning of the blood, including some analgesics or anti-inflammatory agents which are in common use such as aspirin and naproxen sodium (commonly known as Aleve). Their blood-thinning action significantly interferes with the mechanism of blood clotting which normally seals the surface of a wound and thus prevents further bleeding and makes it possible for even small injuries to bleed indefinitely. This situation is further complicated by the fact that for practical reasons, it is not possible to prevent further bleeding by bandaging a wound that occurs in the rectum. It is therefore sensible to avoid experimenting with anal play, especially for the first time, until at least a week after ceasing the use of such drugs.
The treatment for persistent or heavy bleeding will require a visit to an emergency room for a sigmoidoscopy and cauterization (sealing the injured tissue with a heated object) in order to prevent further loss of blood. Apart from the volume of blood that is lost into the rectum, other easily-observable indications that medical intervention is urgently needed as a result of blood loss are an elevated heart rate and a general feeling of faintness or weakness.
Some objects can become lodged above the lower colon if they are pushed too deeply inside; here they cannot always be dislodged by forcing a bowel movement. Such foreign bodies should not be allowed to remain in place for any length of time. Medical help should be sought if the object does not emerge of its own accord within a couple of hours, and sooner if it is hard, large, has projections or sharp edges, or if bleeding occurs. Small objects with dimensions similar to small stools are less likely to become lodged than medium-sized or large objects like cellphones, potatoes or, unfortunately, dildos; they can usually be expelled by forcing a bowel movement. It is always safest if a graspable part of the object inserted remains outside the body, where it can easily be pulled out.
Minimizing the amount of feces present in the rectum may also help. To do this, one may try increasing the amount of insoluble fiber present in the diet. Besides being beneficial for general health, insoluble fiber will also help clear the rectum of feces when defecating.
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