@nutbastard: Except they're tweaking the numbers quite well:
"Inclusion of multiple DGUs reported by half of the 19 NSPOF respondents increases the estimate to 4.7 million DGUs"
Data from about 20 people can be extrapolated to the entire US population? I never knew that!

This explains it rather nicely:
http://johnmoynes.com/2010/06/27/you-cant-be-eurosceptic-without-breaking-eggs/

lulu: Kids aren't having sex younger:
http://www.nytimes.com/2009/01/27/health/27well.html

Also, what's wrong with having lots of sexual partners? You're not instantly given a sexually transmitted infection or an unwanted pregnancy after you've had a certain number of partners. As long as people practice safe sex, it doesn't matter how many partners someone has had.