Often referred to simply as anal sex, anal intercourse is sexual exercise that entails inserting the penis into the anus. In a 2010 medical evaluation article of heterosexual anal sex, anal intercourse is used to specifically denote penile-anal penetration, and anal sex is used to denote any type of anal sexual activity. As with most forms of sexual exercise, anal sex members risk contracting sexually transmitted infections . Anal intercourse is considered a high-risk sexual follow due to the vulnerability of the anus and rectum. The anal and rectal tissues are delicate and don’t provide lubrication like the vagina does, to allow them to simply tear and permit illness transmission, particularly if a private lubricant is not used.