My son is three and a half. We can already tell he's not going to be gay. All we have to do is watch him. For instance, his reaction to Raquel Welch's opening number on The Muppet Show?
He plastered himself to the plastic kid fencing in front of the television, and goes "Oooh...yeah..." and refused to move until she wasn't on the TV screen anymore.
I think he'd have been less obvious at Hooter's. That was seriously disturbing.
25 minutes ago