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. While anal sex is commonly associated with male homosexuality , research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections STIs. Anal sex is considered a high-risk sexual practice because of the vulnerability of the anus and rectum.

Science is currently trying to figure out why so-called prostate orgasms feel so intense—but, frankly, the why is unimportant. So, I talked with Sex and Relationships coach Dr. Charlie Glickman, PhD, who literally wrote the book on prostate pleasure to explain just how to enjoy this under-appreciated erogenous zone. Glickman's first point? Plus, porn stars are people who are likely having anal sex multiple times a week.

Relationships, like produce, milk and reality television stars, have a shelf life. Most couples find that after a few weeks, months or years, the luster fades and the initial carnal fury that brought them together has dissipated. The moldy codgers who get past this sexual brick wall do so by developing an elaborate series of coping mechanisms.

Every guy I've dated has requested anal at some point, even to the point of begging. This experience seems to be ubiquitous in heterosexual relationships. Why do men love anal sex? Does anal really feel that much better than vaginal sex?