Anal sex is penetration of the anus. In heterosexual relationships it has been traditionally used in some cultures as a form of contraception, and of preserving vaginal virginity prior to marriage.
Found on http://www.probertencyclopaedia.com/browse/AA1.HTM
Sexual activity in which the penis is inserted into the anus. Anal sex during pregnancy is usually safe as well. However, if you have hemorrhoids, remember that they tend to become larger during pregnancy. If your hemorrhoids are bleeding and you have anal sex, you can lose a considerable amount of blood, which can endanger both mother and baby. N.
Found on http://www.pregnology.com/AZ/A/6
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. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus (anilingus), and pegging. Though the term anal sex most commonly means penile-an.
Found on http://en.wikipedia.org/wiki/Anal_sex
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