Nature vs Nurture?

It's nature. Boys are naturally gross. I learned this when Jordan chugged his milk, burped extremely loud, and then began laughing hysterically. Nobody better have taught him that. Any idea how hard it is to keep a straight face and tell your burping-laughing child that's "yucky" though? It comes out as "hee-uck-hee". Shoot... maybe it is nurture.