Two transsexuals are at the service of a scientist who has invented a gun that shoots erotic rays and that will be the solution to impotence and frigidity. The couple must protect it from robbery attempts by a gang of criminals.
Eva, a hermaphrodite from birth, with clear signs of both sexes, is raised under the strict guidance of her uncle, Professor Pissinger. The professor surgically implants a device called a “sexmaker” which allows Eva to control her sexual intensity. Unfortunately, this also puts her in the sights of an impotent gangster who wants the device for himself.
Their sexually dissatisfying marriage life changes when Paula discovers her latent masochism after raped by her husband, Fernando. She welcomes Celia, a vicious young woman whom she has met in a park and, in the end, Paula ends up officiating as a dog of both, while Celia will eventually dominate the situation.
