R

The Godfather has lots of murder and a decent helping of sex… but it's really much heavier on the murder. Sonny cheats on his wife and sneaks off to have sex during the wedding, and there's brief nudity when Michael gets it on with his Sicilian wife, Apollonia, on their wedding night. Those scenes push the movie into R territory.

But the biggest, most shocking scenes involve Sonny's extremely bloody assassination, Carlo brutally beating Connie with his belt, Luca Brasi's strangulation, and the mass killing ordered by Michael at the end.