One of the Noblet dolls on Max's shelves has a visible penis.
Max is seen drawing a nude woman. Breasts are visible.
There is some very brief cartoon nudity when Max is shown naked on a desert island. His genitals are seen entirely, but from a distance.
There is a reference to someone's "wife's new breasts"
Mary asks questions about sex and "Where do babies come from?" in her first letter's written to Max. She misspells "vagina" and spells it "vergina" and talks about how she knows "sexing" and asking if babies come from bottles or nuns or eggs
There are some pictures displaying women's breasts in some areas of the film but not graphic as it is not very noticeable