When do you teach kids about the birds and the bees? Psychoanalyst Joyce McFadden says if your child is old enough to identify her earlobe, then "she's old enough to know what her vulva is." When do you teach your kids about sex and sexuality? And how much do you tell them? How did your parents tell you about sex, menstruation, masturbation, and gender differences? Or did you learn from school, church, or your friends? And how does growing up in Las Vegas, with its sexualized attitude, affect how kids understand sex and sexuality? Tell us your story. Experts around the nation weigh in.