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'''Sexual intercourse''', also known as '''copulation''' or '''coitus''', commonly refers to the act in which the male reproductive organ enters the female reproductive tract.[http://www.britannica.com/eb/article-9067000/sexual-intercourse] [http://health.discovery.com/centers/sex/sexpedia/intercourse.html] The two entities may be of opposite sexes or not, or they may be hermaphroditic, as is the case with snails. In recent years, penetration of non-sexual organs (oral intercourse, anal intercourse) or by non-sexual organs are also sometimes included in this definition. Traditionally, intercourse has been viewed as the natural endpoint of all sexual contact between a man and a woman.

'''Sexual intercourse''', also known as '''copulation''' or '''coitus''', commonly refers to the act in which the male reproductive organ enters the female reproductive tract.[http://www.britannica.com/eb/article-9067000/sexual-intercourse] [http://health.discovery.com/centers/sex/sexpedia/intercourse.html] The two entities may be of opposite sexes or not, or they may be hermaphroditic, as is the case with snails. In recent years, penetration of non-sexual organs (oral intercourse, anal intercourse) or by non-sexual organs are also sometimes included in this definition. Traditionally, intercourse has been viewed as the natural endpoint of all sexual contact between a man and a woman.