Reuters via Yahoo reports that June and December are the months in which teens are most likely to lose their virginity. Apparently Christmas is romantic:

Levin and colleagues dubbed the December peak in coital activity “the holiday season effect,” and noted that this was when young females in romantic relationships were the most likely to have sex for the first time.

Or perhaps the teenage male youth of today have discovered the virtues of Bacardi 151 as an eggnog “flavoring.”