Aguenta Tesão (Quanto Mais Sexo Melhor) (1986)

Four couples go to the beach to have fun at a camping site where a lot of sex, and lust goes on. Marcia Ferro's boyfriend hasn't shown up, so there's no one for her. She spends her time watching old porn VHS tapes, imagining dirty things and trekking around the beach, where she finds some horses fucking and finally encounters a strange and horny visitor: Spielberg's ET, only somewhat bigger and uglier.