By Alexandra Klausner for MailOnline. Want to learn how to have safe and healthy anal sex? Simply enroll in Harvard University, one of the most prestigious colleges in the world. The school, which is number two in the nation, offered a seminar on anal sex on Tuesday aimed at promoting a holistic understanding of that specific type of intercourse despite the fact that it is widely considered taboo.
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In humans , the 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 defecation , which is the primary function of the anus. 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. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum. With anal sex , the anus can play a role in sexuality. Attitudes towards anal sex vary and it is illegal in some countries.
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A study on why teenage heterosexual couples may engage in anal sex has revealed a climate of coercion, with consent and mutuality not always a priority for the boys who are trying to persuade girls into having it. Dr Cicely Marston led the study, with the hope that its publication would spark "an urgent need for harm reduction efforts targeting anal sex to help encourage discussion about mutuality and consent, reduce risky and painful techniques and challenge views that normalise coercion. Independent Premium Comments can be posted by members of our membership scheme, Independent Premium. It allows our most engaged readers to debate the big issues, share their own experiences, discuss real-world solutions, and more.
Anal canal , the terminal portion of the digestive tract , distinguished from the rectum because of the transition of its internal surface from a mucous membrane layer endodermal to one of skinlike tissue ectodermal. The anal canal is 2. The canal is divided into three areas: the upper part, with longitudinal folds called rectal columns; the lower portion, with internal and external constrictive muscles sphincters to control evacuation of feces ; and the anal opening itself. The anal canal connects with the rectum at the point where it passes through a muscular pelvic diaphragm. The upper region has 5 to 10 rectal columns, each column containing a small artery and vein.