Death of the sex drive – and the great debate over whether testosterone can help get it back

In 1990, people aged 16 to 44 reported having sex an average of five times a month. By 2000, that had dropped to four times, and by 2010, to three. The next set of results are due later this year, and researchers expect the downward trend to continue — though they do not point to a singular reason for the decline.