The average number of people women sleep with during their lifetime has more than doubled from the previous average of seven, within the last 20 years.
That's according to one of the most detailed studies of people's sexual habits in Britain and the United States.
The third National Survey of Sexual Attitudes and Lifestyles (Natsal) asked several thousand participants about their sexual habits. One finding suggested that people are having sex less frequently.
Authors of the study, also show a rise in women having sexual relations with other women. Findings say modern life may be having an impact on these sexual habits.
The study, which took place on several college campus' throughout Briton (and online for the United States) asked students whether they agreed with the findings and women's current attitudes to sex.
Most asked had several opinions like these: "I think it's a lot more socially acceptable now for women to have more partners before marriage. In college, most girls have an average of five to 10 sexual partners."
"In terms of women kissing other women or sleeping with them it's just one of those normal things now."
"Younger people from the age of 13 are already talking about sex like it's nothing nowadays. If I see two women kissing I often think they're just doing it for fun, not that they are in a serious relationship."
And, "People in school are having sex and if it was ten years ago, they'd probably get judged. But now it seems more normal."
"I also know lots of friends who've had sexual experiences with other women...things like kissing in a club. They aren't lesbians, it's probably just drunken experimenting."
What do you think?