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The penis grows enlarged and firm, the skin of the scrotum is pulled tighter, and the testes are pulled up against the body. As sexual arousal and stimulation continues, the glans of the erect penis will swell wider. As the testes continue to rise, a feeling of warmth may develop around them and the perineum.

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Researchers say the flatworm known as Macrostomum hystrix has one of the craziest reproduction systems ever conceived: In a pinch, it can plunge a natural hypodermic needle filled with sperm into its own head for self-insemination. Related: Female Penis, Male Vagina? Bugs Have Exotic Genitals.

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Corals can reproduce asexually and sexually. In asexual reproduction, new clonal polyps bud off from parent polyps to expand or begin new colonies Sumich, This occurs when the parent polyp reaches a certain size and divides.

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The pygmy sperm whale Kogia breviceps is one of three species in the family Kogiidae in the sperm whale superfamily. They are not often sighted at sea, and most of what is known about them comes from the examination of stranded specimens. The pygmy sperm whales was first described by naturalist Henri Marie Ducrotay de Blainville in He recognized it as a type of sperm whale and assigned it to the same genus as the sperm whale Physeter macrocephalus as Physeter breviceps.

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A CNN investigation found that law enforcement agencies across the country destroyed hundreds of rape kits tied to cases that could still be prosecuted. Eight years after Christine reported being gang-raped, police reopened the case. How the destruction of a rape kit scarred a survivor and handicapped the search for justice.

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A rendering of in vitro fertilization. Imagine two men making a baby. Or two women.

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This gallery of images and movies illustrates the anatomy of spermatozoa from the nematode C. All images are the work of Sam Ward U. Arizona, retiredPaul Muhlrad U.

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Corals can reproduce asexually and sexually. In asexual reproduction, new clonal polyps bud off from parent polyps to expand or begin new colonies Sumich, This occurs when the parent polyp reaches a certain size and divides.

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Scientists have discovered a new kind of 'killer sperm' which stops a female from being able to mate with another species. The study by researchers at the universities of Toronto and Maryland found that female worms that mated with infected males became sterile and, in short order, died. Scientists think that the finding might help solve the mystery of how species divide into distinct groups. The study mated pairs of different species of worms all in the Caenorhabditis genus and observed what happened when the infected worms mated.

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