No sex or nudity is shown, although it is implied that the main character (a 21-year-old girl) and her boyfriend are sleeping together. More specifically, he is her teacher's assistant in one of her college classes, which may bring up questions of morality.
A 7-year-old little girl gives an oral presentation to her class about sex, to prove where babies really come from. She brings a visual aide of a semi-nude woman, but it is only briefly shown on screen, and we don't see much of anything. However, the teacher does look at it and comment that the woman in the picture looks a lot better than his own "flabby" mother.
A young college couple kiss in a few scenes.
A middle-aged woman flirts occasionally.