Forbidden Beach (1985)

The two boys are shown from the rear urinating on the beach; only their buttock and legs are visible. One boy strips naked and runs into the surf; he is only shown from the rear. A teenage boy is shown running out of the surf towards the camera. He is back-lit so, while there is evidence of his penis flopping about, it is not clear in detail. The boys mother is shown nude showering; her breasts and pubic hair are clearly visible.

The boy, being jealous of his mother, twice attempts to kill her suitor, the engineer. Both attempts are rather graphic.