Why does Bill Clinton always look like he's looking at someone's boobs?

So I'm reading Yahoo! News and I'm looking at this great photo of the five living presidents together for the opening of the George W. Bush Presidential Library, and I cannot help but notice in the photo that Bill Clinton has this great, yet goofy smile on his face. See below:

Let's get a closer look here:

Then I thought of other photos of Clinton with a similar grin and thought to myself, "Does Clinton always look like he's looking at someone's boobs?" This journalist wants to investigate the situation to see if my observations are valid.

This is an obvious choice. He appears to say, "Nice rack!" here!

He's going for the grab without taking his eyes off. 

Speaking of going for the grab...and notice how Obama is looking at him. OMG this is too funny!

Girls should recognize this look because it's what guys do when they aren't listening but only pretending to while (you guessed it!) staring at your boobs. Clinton didn't create this look, but he sure perfected it!

This is what happens when a dude gets caught looking at other boobs.

He can't even keep his eyes to himself when he's dancing with his invisible girlfriend.

Bill is really excited to see Pamela Anderson's orbs. Barack cautiously reminds him that Hilary is watching him.

See?

He even has takes his cat Socks out to go hunting for boobage.

"Hey! Nice implants!"

(Laughing out of control here).. There are NO WORDS! 

This is Bill Clinton and he did not approve this message...good thing there's a thing called the First Amendment! I'm sure he would find this hilary-ous!