I have a 7 year old grandson that is in trouble at school. A couple a weeks ago his class drew pictures of pilgrims in school. He is in the second grade. On his picture he added a penis to the men. Now this week, the class had a free time in drawing. My grandson drew penis's quite grafficly. He also at home, will go to bed at night in his PJ's and underware but wake up in the morning and be nude. He is a only child, Is this normal behavior or not?