[Buckeye McFrog]

insisted that he had was sterile due to a childhood case of the mumps.

Hey, that's a good one. Bet Slick Willie wishes he would have thought of that one!

[gleeaikin]

Yes, but Slick Willie “never had sex with that women” meaning full penetrating intercourse, so he did not apparently father a love child with Monica. Having talked some with the under 35 crowd, what they did was “messing around.” Meanings change over time.