http://www.newsweek.com/surge-unprotected-sex-upcoming-holiday-new-year-1854255

Morning after pills sales are expected to spike by 10 percent in the first week of the new year, experts have warned. Why? Because, as a nation, we are having more unprotected sex on New Year's Eve than any other holiday, according to a new study.

In a paper published in the Christmas issue of the British Medical Journal, researchers from Texas Tech University assessed the sales of emergency contraception in the days immediately after the New Year's celebrations. Specifically, they analyzed sales data for levonorgestrel, the active ingredient in Plan B and most other over-the-counter morning after pills.