They are called what?

Ok, I've been thinking about how to post this for awhile.  My two kids, love them both.  The older one is starting to get a lot of humour and he laughs at words like ass.  That's funny, right?  But we can't say that in front of the little guy.

So, the little guy, he is so cute.  He has two words for those, you know, male things.  They hang down in between your legs... the balls.  Right, I said it.  SO, he calls them nickels.  Nickels?  Ok, maybe pennies he is just 3 after all.  Then he calls them beaks.  Really?  I kinda get nickels, but beaks?

Kids think so differently and do not have the reference that adults have.

Ahhh.. to be a kid again and think the world is so simple.