Well... The study was made by Durex condoms company. It was conducted on a sample of individuals from each country studied, saying how many times they have sex per week. And they obtained these results on average per year. Unfortunately (for you?) USA is not on the top 10 list but I may reassure you by saying that it is an AVERAGE and that it does not reflect EVERYONE's sex life.
What led you to believe that Americans have a lot of sex? In spite of the image pushed by Hollywood and Madison Avenue (and some moralist detractors of the country), a great many American are sexually neurotic prudes.
another good reason why Eastern Europe is cool, or maybe this is just the result of the fact that they also have the highest alcohol consumption per capita in the world...
Ad kalabhamut - I am sure you have a point. Plus, I would also add that during the communist times, there were not that many things our parents were allowed to do in their free time, and gradually, this particular pastime became local tradition (:
I just spent a few weeks in Bulgaria and am having a hard time believing they made this list. The girls there were often hot, but also very conservative.
http://www.davidmixner.com/2011/12/what-are-the-ten-most-sexually-active-countries.html