Genes may help explain why different people lose their virginity at different ages, according to a new study out of the University of Cambridge published in Nature Genetics.

Along with religious beliefs, family background, and peer pressure, genetic differences can account for a quarter of the variation in the age at which an individual first has sex. One of the genes linked to an earlier start to one's sexual odyssey, CADM2, is also correlated with risk-taking behavior and having a large number of children.

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