It's wrong to watch naked people.
Phil is uncomfortable when he notices that his neighbor sometimes forgets to draw the curtains when she undresses.
Phil wants to be comfortable with his neighbor.
Phil goes over to his neighbors house and explains the situation to her.
Phil starts to purposely look for opportunities to watch his neighbor undress and becomes familiar with her body.
Phil is relieved when his neighbor installs screens that make it impossible to see into her room.
Phil gets charged as a peeping tom when his neighbor catches him and calls the police.