How to tell kids why it's so

They are believed to be too young to know the difference between girls and boys. So they are given one bathroom in kindergartens. The other day a friend of mine found her four-year-old peeing like a boy. She shouted to her to stop. But the little girl replied in a bold and confident manner. "We all do it this way." Later he found that most of the kindergartens in Beijing give their kids one lavatory to relieve themselves because they do not have that much space for two. A survey of parents in Beijing revealed that 70 percent of the adults were against the way their kids share the same toilet with those of the opposite sex, and half of them have given their children sex education.

Is this the way to teach the pre-schoolers things about sex? For sex education, how young is too young? It is said that by age three or four, children often realize that boys and girls have different genitals. As natural curiosity kicks in, children may play "doctor" or examining each other.

Seemingly, the issue is not toilet but how adults inform the kids and handle their exploration and questions. Ready for queries: How do babies get inside a mommy's tummy? How are babies born? Why doesn't everyone have a penis? Why do you have hair down there?