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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 Senator Lamar Alexander (R-Tenn.), who chairs the Senate health committee, will be retiring at the end of his term, Stat News reports.

UCSF researchers find that having two X chromosomes may contribute to women's longer lifespans, according to Discover's D-brief blog.

The Wall Street Journal reports on the US Centers for Disease Control and Prevention's use of genetic approaches to study foodborne illnesses.

In PNAS this week: immune cell profiling of wild baboons by social status, metabolomics profiling of esophageal tumors, and more.