Bet you didn’t know that more than three-fourths of senior citizens are having sex. Surprised? LiveScience has nine more surprising sex discoveries that you probably didn’t know about.

More than three-fourths of senior citizens are having sex, contrary to what they probably expected would be the case when they were younger. A separate study in the New England Journal of Medicine in 2007 found that more than half of 75- to 85-year-olds reported having sex at least twice a month.

Read the full story at LiveScience.com.