Nature vs. Nurture (or boys will be boys)

I'm very happy to be the mother of two sons. Not that I don't like female children, but from my vast experience in working with children I have found boys to be simple. Not simple as in lacking mental acuity, but easy to understand and deal with. I have found boys to be generally rougher and tougher than girls, with far fewer dramatics. I have also found that boys have a natural proclivity for annoying girls. I'm beginning to notice this in my oldest son.
Even though I know that boys love to pester and annoy girls, I wasn't sure where they learned their methods. By watching my own son I'm beginning to think they don't learn them from anyone. They are born knowing exactly what to do to aggravate, annoy, pester, and otherwise torment any female they happen across.
Let me cite some examples. My three year old son has several tricks up his sleeve, and since I'm the only female in the house I get to enjoy all of them. He likes to sneak up behind me, lick his finger and wipe it on my face. Sometimes he'll skip the finger part and just lick my face. He'll pretend he's going to give me a kiss when he's actually going to lick my face. During dinner he'll lick his finger and stick it into my food. He'll tell me that he has to use the potty so that I'll get up to take him to the bathroom. As soon as I get up he steals my chair. He's also a nipple twister. The list goes on and on.
I've noticed he doesn't do these things to his father, only me. To my knowledge he has never seen anyone else exhibit these behaviors, so I don't believe he learned them from anyone. I believe these behaviors are inborn. He can't help it. Boys can't help it that they are annoying, it is their nature. Boys will be boys, I guess.
Lucky for my son he also inherited my blue eyes and his father's charm, otherwise he might not survive to adulthood. Especially if he keeps licking my food.