Travis' penis

Travis has delighted himself by suddenly finding his penis! He gets little baby boners on the changing table all the time. (It's really cute, I tell you!) Especially when Jeff's changing him and he gets one. I hear "Look at your big 'ol penis, Travis!" or "That's my big dick boy! Just like Daddy!"
(Men...) :)

But, that's not what I take issue with. My problem is that all of a sudden Travis wants to TOUCH it. That in itself I have no problem with, of course! But, he never does it never during a pee diaper, only during a poopy one.
So, why is it that my little boy only notices he has a penis during the most foul diaper changes? Anyone? Seriously, I am really curious about this!