Anyone watched the Singaporean movie "I not stupid 2"? I think that's a very good example of why this awareness is important. The poor boy thought he made the girl pregnant by sleeping next to her.
However, these are the stories that we got when we try to learn more when we were young:
1. Where did I come from?
Rubbish bin. Better answer is mummy's tummy. But how it got there, no one knows.
2. When a girl sleeps with a guy, she gets pregnant. Of course in this case, our young minds comprehend sleep as well.... sleep.
In our naiveness, some kids even came up with this logic to understand what's the difference between sex and making love: If one has sex, you can get pregnant. But if one make love, you can't get pregnant.
And all because our parents and the outside world are too embarassed to explain this to us.
A wise man refrains from talking but a fool utters rubbish.