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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Two researchers have found that behavioral genetic defenses in criminal cases don't tend to affect outcomes, according to Popular Science.

Researchers report that while host genetics influence the oral microbiome, they don't appear to affect cavity-causing microbes, the Economist says.

Pandas' gut microbiomes change as what they eat changes with the seasons, writes Discover's Inkfish blog.

In PLOS this week: comparative genomic study of malaria-linked macaque parasite, search for apple root reference genes, and more.