Toddler and his "pee pee"

Amanda • Expecting baby #2 Christmas Day. Our son is 3 and super excited to find out if he is having a baby brother or sister.
My three year old LOVES to play with his "pee pee" while he watches tv before bed. Right now I just ignore it but I feel like I should be teaching him some kind of "pee pee" etiquette but I don't want make a big deal out if either. 

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