An object study of Biasing a study

I found this study that loudly proclaims that 1/3 of american football players had sexual relations with other men.
It isn't until you get to the third paragraph that they tell you that the study group of these men didn't make it from the high school ranks into college football and became CHEERLEADERS instead. Do you think that MIGHT bias their study just a tad wee bit?

http://www.sciencedaily.com/releases/2007/10/071029100619.htm

This is what they want to teach your children. Stop them