Legality of NFL teams asking College Players about their Sexual Orientation

Can NFL teams legally ask college players about their sexual orientation? They clearly shouldn't, but legally it's a complicated issue involving states' anti-discrimination laws and federal labor law, as I write about in this week's issue of Sports Illustrated (March 25, 2013 issue). My article is titled "Loaded Question" and it's on page 16. Special thanks to the smartest lawyer around,