The pretty things in nature are often poisonous.
Toadstools,
Frogs,
To name a few.
The brighter the color,
The prettier they look,
The more poisonous.
Same thing about girls.
Pretty girls are all poisonous.
If you throw caution to the wind,
Do not cry when you are nursing your wounds.

Talking about protection,
Take the following analogy into consideration.
Even if everyone else says she's a bitch,
I will still insist on my policy,
Of judging from my own experience.
And not listening to rumours.
So everyone says she sleeps around.
But you didn't care,
Because she says "I'm a virgin."
So you left your condom at home.
And now a HIV-positive you is crying.

Not exactly a correct analogy.
But neh-mind right?