I tried streching my anus the other nite with a cucumber. It was a big ass cucumber too! It hurt but felt so good.
The human anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecationwhich is the primary function of the anus. These are the internal anal sphincter and the external anal sphincterwhich are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning.
Takeaway: Anal stretching is a key component of higher-level anal play - and it isn't as scary as it sounds. If you're new to anal playyou might be thinking, "what?! Why would I want to stretch my butt?!
The first rule of anal play is lube, lube, and more lube. Rectums do not produce their own lubricant the way vaginas do, so if you're going to be sticking anything up your bum you need to grease it up first. Everyone has their own preferences when it comes to lube.
When a tubular organ or blood vessel becomes excessively narrow such that it can no longer perform as nature intended, it is a condition referred to by physicians as stenosis. Anal stenosis, also known as an anal stricture, is the narrowing of the anal canal, located just before the anal sphincter. The anal sphincter is a complex part of the body that maintains a seal that can be opened to discharge body waste.
Anismus is the failure of the normal relaxation of pelvic floor muscles during attempted defecation. It can occur in both children and adults, and in both men and women although it is more common in women. It can be caused by physical defects or it can occur for other reasons or unknown reasons.
Perhaps the biggest question of all: Can backdoor sex do permanent damage to your butt? As it turns out, kegelsthe exercise made famous for strengthening your pelvic floor and possibly boosting your orgasmcan also tone up your sphincter, he says. While anal is relatively safe for your butt muscles, Kerner says there are a few other things you should be doing to keep your booty in healthy working order.
According to a new study, anal sex may lead to fecal incontinence. I guess that throws a wee bit of a wrench into the benefits of anal sexbecause no one, and I mean no one, wants a leaky butt. Of the 6, adults surveyed nationally by researchers at the University of Alabama at Birmingham, 5 percent of men and 37 percent of women had tried anal sex at least once in their lives.