"Mum? I've got a question. The guys at school are using words I don't understand." "What words, dear?" "Pussy and bitch." Mum inhaled sharply, but then said, "Oh, that's easy. A pussy is a cat, like our little Mittens. A bitch is a female dog, like our Sandy." "Thanks, Mum." He then found his Dad out in the garage. "Dad, the guys at school are using words I don't understand." "What words, son?" "Pussy and bitch. I asked Mom, but I don't think she told me the right meaning." Dad said, "Son, never ask your mother about these things, ask me instead. Let me explain it like this... " He pulled a Playboy from his workbench, turned to the centrefold, drew a circle around the pubic area and said, "Son, everything inside the circle is pussy." "Okay, Dad. Then what's a bitch?" Dad replied, "Everything outside the circle!"