Levi Fires Back -- Bristol's Not 'Realistic'

5/6/2009 8:22 AM PDT
Minutes after Bristol Palin preached about abstinence being the best way to prevent teen pregnancy, her baby daddy was already calling her out on a morning show of his own...

Levi Johnston told "The Early Show," "I don't just think telling young kids, 'you can't have sex' ... it's not going to work ... it's not realistic."

For the record, the unwed teenage parents did use protection ... some of the time.