In the dimly lit confines of their Curitiba home, a 'safada' (naughty) wife and her 'corno' (horny) husband engage in a thrilling game of cuckolding. She, a 'puta' (slut) at heart, welcomes her friend, a 'piranha' (man-eater), into their bed. The two women, their bodies entwined, tease and taste each other, their moans echoing off the walls. The husband, hard and aching, watches, capturing their every movement on film. As the women's passion intensifies, so does his desire, until finally, he can no longer resist, joining them in a wild, taboo threesome.