Definition of Anal Sex: To have anal sex or anal intercourse is a kind of sexual behaviour from humans. When you have anal sex, many parts of the rectum zone take part: the anus, anal cavity, the sfinter and rectum... The term "anal sex" is normally used to define the penetration of the penis into the rectum.
Anal sex is a high risk sexual activity because of the vulnerability of anal tissues and its septic nature.
Anal sex has been reported in many different cultures from a long time ago; it also has been considered a controversial activity and it has occasionaly been banned from ancient times.
This activity is performed by people of all identities and sexual orientations, but it's commonly related to gay men, even though 10% of straigh couples have anal sex on a regular basis.
Some Gay men call themselves "active" or "passive" when they perform anal sex, but mostly they change their sexual roles, what is known as "versatile".
There are some anal penetration contexts performed by straight men who perform this activity because they are single.
