Ego. I saw this before.

Family Name, gees people.

I had thought that but it isn't it.

Posting the entirety of the riddle just makes That Guy's response worse.

The Pope has it but he does not use it.
Your father has it but your mother uses it.
Nuns do not need it.
Arnold Schwarzenegger has a big one,
Michael J. Fox's is quite small.
What is it?

^ lol

Really, it isn't family name? Because that's the correct answer.

I'm really not sure. All I remember is my base instinct being wrong and that would seem like an answer I had given.

I think it is family name.

^Yeah, it is family name. The riddle is intended to make you say "Penis", it's one of those "Wow, you have such a sick mind!" things.

What stinks when living and smells good when dead?

A skunk?

We've got some smart cookies here!

"Whoever makes it, tells it not. Whoever takes it, knows it not. And whoever knows it, wants it not."