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having sexual intercourse]] Sexual intercourse is the pairing of opposite- Sex (or Hermaphroditic Internal Fertilization animals) for copulation. The primary biological purpose of sexual intercourse is the creation of Offspring . Copulation is the union of the Sex Organ s of two Sexually Reproducing animals for Insemination and subsequent Internal Fertilization . The two individuals may be of opposite sexes or Hermaphroditic , as is the case with, for example, Snail s. For most animals, sexual intercourse is used only for s are known to engage in sexual intercourse even when the female is not in Estrus (the most fertile period of time in her reproductive cycle). In most cases people have sex for pleasure, and so this behavior in animals is also presumably for pleasure, which in turn strengthens social bonds. ''See Functions Beyond Reproduction ''. IN ANIMALS Many animals which live in the water use External Fertilization , whereas ''' Internal Fertilization ''' may have developed from a need to maintain Gamete s in a liquid medium in the Late Ordovician epoch. Internal fertilization with many vertebrates (such as Reptile s, some Fish , and most Bird s) occur via Cloaca l copulation (see also Hemipenis ), while Mammal s copulate Vagina lly, and many Basal Vertebrate s reproduce sexually with external fertilization. However, some Terrestrial Arthropod s do use external fertilization. For primitive Insect s, the male deposits Spermatozoa on the substrate, sometimes stored within a special structure, and Courtship involves inducing the female to take up the sperm package into her genital opening; there is no actual copulation. In groups such as Dragonflies and many Spider s, males extrude sperm into secondary copulatory structures removed from their genital opening, which are then used to inseminate the female (in dragonflies, it is a set of modified Sternite s on the second abdominal segment; in spiders, it is the male Pedipalp s). In advanced groups of insects, the male uses its Aedeagus , a structure formed from the terminal segments of the abdomen, to deposit sperm directly (though sometimes in a capsule called a " Spermatophore ") into the female's reproductive tract. See Also: Mating |
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| "http://wwwinformationdelightinfo/information/entry/Love_bug" class="copylinks">Love Bug s mating |
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| "http://wwwinformationdelightinfo/information/entry/Tortoises" class="copylinks">Tortoises mating |
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| "http://wwwinformationdelightinfo/information/entry/Dragonfly" class="copylinks">Dragonflies mating |
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| "http://wwwinformationdelightinfo/information/entry/Butterfly" class="copylinks">Butterflies mating |
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| "http://wwwinformationdelightinfo/information/entry/Anthomyiidae" class="copylinks">Anthomyiidae flies mating |
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| "http://wwwinformationdelightinfo/information/entry/Cockatiel" class="copylinks">Cockatiel s mating |
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| "http://wwwinformationdelightinfo/information/entry/Herring_Gull" class="copylinks">Herring Gull s mating |
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