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This is Scientific Americans' 60-second science.

I'm Steve Merski. Got a minute?

So human papillomavirus or HPV now causes the majority of tonsillor cancers in the United States in many Western nations, and the risk of these cancers has been increasing.

Gypsy Amber D'Souza of Johns Hopkins University, February 12th at the annual meeting of the American

Association for the Advancement of Science in Washington, D.C.

And it's much higher in men than in women.

We know performing oral sex is the main risk factor for oral HPV infection.

And our research shows that performing oral sex is more common in younger

generations than in previous generations, and that people are not only more likely to have

performed oral sex, but with more partners and to initiate it at an earlier age. And all of

these differences in sexual behavior across age cohorts or generations do explain the differences that we see in oral HPV prevalence and in HPV-related orpharyngeal cancer across the generations and why the rate of this cancer is increasing.

But differences in sexual behavior do not explain the differences that we see between men

and women in oral HPV infection and HPV-related cancer.

Men are not only more likely to become infected with oral HPV infection than women, but

our research also showed that once you become infected, men are

less likely to clear these infections than women, further contributing to their cancer risk.

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