In Focus:

You're More Interested in Sex During the Holidays

More babies are born in September than any other month in the United States, which means that nine months prior—right around Christmas and New Year’s—is the most popular time of year for conception. Many scientists think this spike in fertility is a biological response to changing seasons. As temperatures drop and nights get longer, the theory goes, humans begin to hunker down, partner up, and think more about sex.

But a new study in Scientific Reports&nbs

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