penis-in-vagina sex. Sometimes, sexual intercourse is called coitus, copulation, mating, or fornication, and is more casually known as having sex or sleeping...

cross-fertilization, or "crossing" if the offspring have DNA from both genetic sources. Copulation is the union of the sex organs of two sexually reproducing animals for...

oviduct. Insemination happens naturally during sexual intercourse, or copulation. It can also be done artificially, in which case it is called artificial...

animals. It is used to inseminate females (or hermaphrodites) during sex (copulation). In some animals, the penis is also used to urinate. Penises are found...

mark the territory. Sometimes, animals signal that they are ready for copulation. Animals with anal glands include: Many primates, including humans Most...

observation has shown it is usually a female hitting a male to prevent copulation. When a doe is ready to mate, she runs across the countryside, starting...

5 in) long, males between 6 and 11 cm (2.4 and 4.3 in). A swimming frog Copulation trial between two males Proof of cannibalism Close-up of the frog head...

species. Competition can be before or after sexual intercourse. Before copulation, intrasexual selection – usually between males – may take the form of...

counteradaptation of kicking at males during mating, which reduces the time spent in copulation. Some regard sexual conflict as a subset of sexual selection (which was...

after they were replaced by Latinate words like "urinate", "defecate" and "copulate" - which polite people were supposed to use after the Norman conquest of...

sperm duct has two or three spiny structures that presumably help in copulation. The larvae are free-living. Their closest relatives may be the phyla...

often serve as sensory organs, but they may also be used as weapons or copulation aids, or they may simply be vestigial structures. The cerci on some species...

not recognize sexual cues given by other species. Mechanical isolation: Copulation may be attempted but transfer of sperm does not take place. The individuals...

sex with animals also occur in people who do not show any interest in copulating with animals in real life. According to Nancy Friday this might be a way...

ostentatiously during courtship, both before and after pairing, and extrapair copulations are frequent.(Torres, Velando. 2004) Torres, Roxana; Velando, Alberto...

For oral sex on a man see fellatio. For oral sex on a woman see cunnilingus. Oral sex is when one partner uses the tongue, mouth or throat to excite the...

are native species which are much larger). It has an unusual habit of copulating on the surface at night, which makes it more visible than most other earthworms...

a devil regardless of appearance. Fertilization occurs 4 hours after copulation, and the female lays jelly-like eggs into the sea. The phytoplankton is...

the female, licks her genitalia. Finally, the male fruit fly attempts copulation by curling his abdomen under hers. The female can, however, kick the male...

walking legs. Female hermit crabs usually lay their eggs shortly after copulating (mating) but they can also store sperm (male sexual cells) for many months...

reproduction escaped him as he wrote, "I do not believe the male bees actually copulate with the females." "...whereas modern biologists speak of the grub, the...

myeloid leukemia, sources say". NBC News. One count of forcible oral copulation, one count of sexual battery by a foreign object, and one count of forcible...

was a constant theme, as was medical knowledge: Concerning Witches who copulate with Devils. Why is it that Women are chiefly addicted to Evil superstitions...

became very famous. It features Hilton performing oral sex on Solomon and copulating with him and features some night-vision camera. Paris Hilton is known...

flows down to meet the Damodar River (male), symbolizing the "opposite copulation" pose (vipareeta rati) described in the meditation (dhyana) of Goddess...

zebras. Usually this is done because males harass pregnant mares or force copulation. Scientists have raised the question, how often this occurs in the wild...

several types of behaviour, including eating, drinking, defecation, and copulation. The cerebellum adjusts the output of other brain systems to make them...

behaviour, including but not limited to eating, drinking, defecation and copulation. These behaviours satisfy short-term needs, and are called 'consummatory'...

Desert locusts in copulation...

Environment. [1] Joyce W.G. et al 2012. Caught in the act: the first record of copulating fossil vertebrates. Biology Letters [2] Full free access. George W. &...

chooses a member of its own species in most cases. Mechanical isolation: Copulation may be attempted but transfer of sperm does not take place. The individuals...

Skeletons mounted as if in copulation: Jurassic Museum of Asturias, Spain....

of animal homosexuality date back to Aristotle, who described same-sex copulation in birds 2,300 years ago. Large-scale academic research was delayed for...

145.113.252.748 – sex behavior, animal MeSH F01.145.113.252.748.200 – copulation MeSH F01.145.113.252.748.400 – pair bond MeSH F01.145.113.367 – eliminative...

hours, so males must find them quickly. Males may fight each other, and copulation happens every 20–50 minutes. Kittens weigh 60 to 93 g (2.1 to 3.3 oz)...

Copulation refusal action...

Schistosoma mansoni Schistosomes copulating Scientific classification Kingdom: Animalia Phylum: Platyhelminthes Class: Trematoda Order: Diplostomida Family:...