Dad, I need to learn about sex!

This kid walks up to his Dad and says, "Dad, I'm 14 years old, my voice is changing, I'm growing hair in weird places, I need to learn about sex."
His dad replies, "No, no, no, you're too young for all that. If you want to learn about sex, go practice in the hole in the oak tree out back."
A couple years later kid walks up to his dad and says, "Dad, I'm 16 years old, I can drive, I got a girlfriend and I need to learn about sex."
His dad replies, "No, no, no, you're too young for all that. If you want to learn about sex, go practice in the hole in the oak tree out back."
Kid walks up to his dad when he's 18 and says, "Dad, I'm a man grown. I can buy cigarettes, I can gamble, I can vote, I can even go and die for my country. I need to learn about sex."
His dad says, "Ok, let's go."
And drives him out to the local whorehouse, has the madam line up the women, and says, "All right boy, pick out whichever one you want, she'll take you upstairs and teach you everything you need to know about sex."
So the boy takes his pick, walks upstairs, and the dad sits down with a proud smirk on his face as he waits....but soon after he starts to hear some real sporadic thuds and things breaking. Then he starts to hear these terrible screams coming from upstairs and more chaos.
Finally the dad runs up the stairs and bangs on the door until the door opens.
And there is his son, fully clothed in a completely destroyed room holding a broom, with the whore cowering scared shitless in the corner.
His dad says, "What in the fuck are you doing in here!?!?"
To which the son replies, "What? I'm trying to scare the squirrels out."