Photo: "Teen Sex" Rising for Cancer-Affected Tasmanian Devils

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A male Tasmanian devil (right) bites a female (left) as part of a mating ritual at the Tasmanian Devil Conservation Park in Taranna, Australia, in May 2007.

Devil populations affected by an unusual contagious cancer—spread through mating bites—are breeding younger, according to a July 2008 study.

Photoagraph by Anoek De Groot/AFP/Getty Images

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