Little Johnny watched his Science teacher start an experiment with worms. Four worms were placed into four separate jars.
The first worm was put into a jar of alcohol.
The second worm was put into a jar of cigarette smoke.
The third worm was put into a jar of sperm.
The fourth worm was put into a jar of soil.

After 24 hrs, these were the results:

Worm in alcohol - Dead.
Worm in cigarette smoke - Dead.
Worm in sperm - Dead.
Worm in soil - Alive.

The Science teacher asked the class, "Now, what can we learn from this experiment?"

Little Johnny quickly raised his hand and said, "As long as you drink, smoke and have sex, you won't get worms!