The Sexperience 1000
The Sexperience 1000 is a survey of British sexual experience, where you can drill down and follow each individual person. So, for instance, you can see that of the 167 people who have had sex in their parents bed (http://bit.ly/plzK2p), 62 shop at Tesco (http://bit.ly/pxRmhJ) and 10 now drive a BMW (http://bit.ly/pBS0HZ)
This also allows you explore individual's experiences. If you go to 'have you ever engaged in partner swapping' (http://bit.ly/oLCRXs) and click on 'Threesome' you'll see that the vast majority of people who enjoy partner swapping have also had a Threesome.