Is it any surprise that pop-punk singer Jesse Lacey's got a thing for underage girls?

That's actually nothing unusual, so no it's not a surprise.  If you knew how many pop / rock stars have had flings with underage girls, you'd probably puke.

And I'm not talking about just the dirt bags here, I'm talking about the respectable mama's boy types too.  It's hard to say no to anything with blue eyes in slutty attire, evidently.  

I could definitely say no, but in fairness I've never had legions of adoring young female fans.  If I did, I'm not sure I could promise to ask every one of them for ID before they unbuttoned anything.

You have.