Possible explanation of the UK productivity gap

I'm sure you know about the UK productivity gap: the UK falls behind the US, Germany or France (more here if you want) in terms of output per hour worked. There are a lot of explanations for this such as less skilled workers, lower capital invested per worker or less effective management in the UK.

This is all good but I'm pointing to another source: the average Brit spends way too much time on the Internet looking for porn. I'm not joking... according to a survey, the UK leads the world in terms of porn download with 40% of male having visited a pornographic web site in 2005 and an increasing number of female as well.

This should be a great subjet for a PhD students: The impact of porn web site on UK productivity. I'm sure there is a correlation!