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[[Image:lighterstill.jpg]][[Image:Sex-art-1.jpg|right|frame]]
[[Image:lighterstill.jpg]][[Image:Sex-art-1.jpg|right|frame]]
'''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.
Non-penetrative sexual contacts and mutual masturbation are usually referred to as ''outercourse'' (oral sex may or not be penetrative),
Sexual intercourse for most animals other than humans occurs at the point of estrus (the most fertile period of time in the female's reproductive cycle),"Females of almost all species except man will mate only during their fertile period, which is known as [[estrus]], or heat..." However, in most instances, humans have sex primarily for pleasure. This behavior in the above mentioned animals is also presumed to be for pleasure, which in turn strengthens social bonds.
Sexual intercourse for most animals other than humans occurs at the point of estrus (the most fertile period of time in the female's reproductive cycle),"Females of almost all species except man will mate only during their fertile period, which is known as [[estrus]], or heat..." However, in most instances, humans have sex primarily for pleasure. This behavior in the above mentioned animals is also presumed to be for pleasure, which in turn strengthens social bonds.