A.B.C of Anal Sex

Anal sex or anal intercourse is the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure Other forms of anal sex include fingering, use of sex toys to penetrate the anus/rectum, anilingus, and pegging. Sources sometimes use the term anal intercourse to refer exclusively to penile-anal penetration, and anal sex to refer to any form of anal sexual activity (especially between two or more people, as opposed to masturbation).

Often, strong views are expressed with regard to anal sex; it is controversial in various cultures, especially with regard to religion, commonly due to prohibitions against anal sex among gay men or teachings about the procreative purpose of sexual activity.  It may be regarded as taboo or unnatural, and is a criminal offense in some countries, punishable by corporal or capital punishment; by contrast, people also commonly regard anal sex as a natural and valid form of sexual activity that may be as equally fulfilling as any other desired sexual expression. They may regard it as an enhancing element of their sex lives or as their primary form of sexual activity.
As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections (STIs/STDs). [15][16]

Anal sex is considered a high-risk sexual practice because of the vulnerability of the anus and rectum. The anal and rectal tissues are delicate and do not provide natural lubrication, so they can easily tear and permit disease transmission, especially if lubricant is not used. Anal sex without protection of a condom is considered the riskiest form of sexual activity,  and therefore health authorities such as the World Health Organization (WHO) recommend safe sex practices for anal sex.