Casual Games and Gender

The Casual Games Association has released their Casual Games Market Report 2007 . Would be interesting to get my hands on it as an article on it says that men play casual games as often as women which is different to the common believe that most casual gamers are women. Seems the men don't like to admit they play these "little" games.
I wonder how they got their data. Most classical casual games websites told me the huge majority of their visitors would be women. So where do the men sneak in?
One possible solution could be that men are more likely to play on www.newgrounds.com etc.. Most Games there can also be called "casual" if you mean easy to pick up. But on the other hand many of the games on newgrounds have some gore which is something which does not fit other definitions of casual games. For example you won't find any gore on pogo.com etc. Could turn of the women...