"At our base level we are animals. And so, my theory is that women are only considered attractive as long as they look fertile because we, as humans, are made to reproduce and move on. And so we kind of can't ever get away from our animalistic nature, in a way."
Source : "Bristol Palin Slams Obama's Gay Marriage Stance: It's Based on 'Too Many Episodes of Glee'" by Todd Gilchrist, www.hollywoodreporter.com. May 10, 2012.