New Words

A young lad comes home from school and says to his mom, 'Mom I've got a problem.'
'Tell me,' she says.
He tells her that the boys at school are using two words he doesn't understand. She asks him what they are.
He says, 'Well, 'pussy' and 'bitch'.'
'Oh, that's no big deal,' says the boy's mom. ''Pussy' is a cat, like our little Mittens, and 'bitch' is a female dog like our Sandy.'
He thanks her and goes to visit dad in the workshop in the basement. He says to his dad, 'Dad the boys at school are using words I don't know, and I asked mom, but I don't think she told me the exact meaning.'
'Son, I told you never to go to mom with these matters, she can't handle them. What are the words?' asks the boy's dad.
He tells him the words are 'pussy' and 'bitch.'
'OK,' says dad and pulls a Playboy down from the shelf. Taking a marker, dad circles the pubic area of the centerfold and says, 'Son, everything inside this circle, is pussy.'
'OK, dad, so what's a bitch?'
'Son' he says, 'everything outside that circle.'