Japanese dead last in sex survey -- says Mainichi

According a report in the Mainichi Shimbun:

Flopping again! Japanese trail the world in sex once more - Results of this year's Durex Global Sex Survey have come out and once again the Japanese have come dead last when it comes to sex among over 26,000 people from 26 countries across the world.

I don't trust reports like this at all, so I tried to look around on the internet to get some information on this study, and I couldn't find anything. The last study listed on the Durex homepage is the 2005 survey. Also there are no other news story similar to this one. Could this report be bogus? I'll look around a bit more and hopefully add an update to this page after I've discovered something. Update 1: Okay, I think I found the survey. They changed the name from sex survey to sexual well-being survey. Here is the link. I will comment on the methodology as soon as I have a chance. 日本語で: セクシャルウェルビーング グローバルサーベイ