I checked with my kids, and this was what they said:

  • Eryk, 7 year old boy: You practice on Mommy a whole bunches.

  • Caitlin, 9 year old girl: Your lips suddenly become magnetics and you can't stop your lips from sticking to your boyfriend. (I don't like the sound of that explanation!)

  • Kelsey, 13 year old girl: When you really love a boy, it just happens. Usually you're alone or in a car. Your lips know just what to do.

I suddenly have the uncontrollable urge to buy large quantities of shotgun shells and rock salt.