Definition of "anal intercourse" []

• Intercourse via the anus, committed by a man with a man or woman (noun)

WordNet. Princeton University. 2010.

• "Kelly and his collaborators (1997) found a 45 percent increase in condom-protected anal intercourse (unprotected anal intercourse is one of the main means of HIV transmission for gay men) by customers in the gay bars in the four intervention cities, as compared to four control cities."