Pretty much what it says in the title... Here is the link to the article.
I know that most of us have no issue gaming with those of the female persuasion, but we are gaming as adults. I found this article interesting primarily because the experiment, if you want to call it that, used 9- to 11-year-old boys and girls, the age many of us were when we first got involved with the hobby. With nary a girl in sight. I think I was in college before I ever saw a girl at the same game I was at.
For any who might still be doubtful about the premise of the idea, I will just leave you the last line of the article itself:
Gender bias loses saving throw versus truth. Stereotype defeated. Huzzah!