Little Tommy went into his parent's bedroom one morning and saw his mommy on top of his daddy. He didn't understand what was happening, but figured he'd ask his mommy later. So, that afternoon, Tommy asked her, Mommy, what were you doing on top of daddy?
She stuttered for a second and said, Well, you know how daddy is getting a little fat? Tommy said, Yes. Then his mommy said, Well, if I lie on top of him, it makes him slim again.
Tommy looked confudes, But mommy, that won't work.
But, honey, said Tommy's mother, why not?
Tommy said, Because after you go to work, the lady next door comes and blows him back up.