Parents Guide for
Reazione a catena (1971) More at IMDbPro »

There is a lot of nudity, a girl goes skinny dipping, full nudity shown, two are shown having sex (nude, later killed)

An old woman is strangled and then her attacker is stabbed to death (blood seen), a girl has her throat slashed (graphic), a man has a machete smashed into his face (graphic), two have a spear stabbed through them (graphic), a woman is beheaded (graphic), one is strangled with a telephone cord, a woman is strangled, a man has a spear stabbed through his chest, two are shot, another is stabbed with scissors but his death is implied