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It is implied that both Indy and his father have sex with the attractive Elsa. We see Indy and Elsa engage in foreplay, ending with them laying on the floor, in bathrobes, passionately kissing. Indiana Jones is tied up to a chair and elsa kisses him passionately.
Most of the violence is in the form of physical combat and gunshots. However, much of the violence is rather comical and light and blood is rarely shown. If it is, it is hard to locate.The most violent scenes come a third of the way into the movie. There is the tank chase where Indy shoots through 3 Nazis with a handgun, surrounding cars explode, a the major fight between Indy and Col. Vogel atop the runaway military vehicle.And finally during the attempts to find the Holy Grail in the Canyon of the Cressent Moon- two men are decapitated, with one of their heads even rolling across the stones. A man gets shot in the chest and you can see blood.
A few damns, maybe a hell. Indy harshly blasphemies "Jesus Christ" and is rebuked by his father. 4 exclamations of "my God".
There is very limited alcoholic or drug use in the film. Elsa lights a cigarette on one scene and champagne or wine is drank in an early scene of the movie.
The major and most intense/frightening scene is that of the villain's death where he rapidly ages. This means that his skin rots in seconds, his hair grows and falls off, and his entire body eventually becomes a dying skeleton. His voice also becomes deep and gravelly and his eyes bulge which may frighten some of the younger viewers. Those who find rats revolting may find one scene disgusting.