Okay, seriously.
You don't always try everything and learn from it.
Your parents and ect. also tell you the other amount of things you should advoid.
It's called RASING YOUR KID.
EXAMPLE:
Dr. Er...whatever-son tells Mr. and Mrs. Sample that thier boy is lactose intolerant.
Does that mean the boy should drink a gallon on milk and have an insane allergic reaction?
Or should he have been told that YOU CAN POSSIBLY DIE FROM DRINKING WAY TOO MUCH MILK.
Playing in the dirt helps immunties, because of all the germs and such that's in it.
Nothing to do with "advoiding stuff".
What you're saying, is that people will tell you not to sleep with "Sluprohooks" (Look above posts if you don't know what this means), or you'll possibly catch a STD.
But to really learn, as you say, they have to sleep with a sluprohook and catch whatever diesease she had.
People also have COMMON SENCE.
I suggest they start using it.
First off, for someone that talks about common 'sence', you sure are making yourself look idiotic. It would take common sense to realise that people raise their kids differently, and sure, you don't always learn things by doing something, but most of the time you do. You won't know if you have a fear of heights until you actually climb up to the top of a tall building. You won't know if you're allergic to something unless you get a reaction. There's millions of things out there that need to be tested in order to be proven, Tacharine.
So please, before you make yourself look even more idiotic, try using some of your common 'sence'.