[Solved] Which of the following is not true of diffusion? A) Uses cellular energy B) Can occur in living and nonliving cells C) May occur both into and out of the cell D) Energy source is cellular Sexual Activity: Behaviors involving the expression of sexuality between individuals, including but not limited to intercourse. Sexual Sadist: A sexual sadist is an individual who derives pleasure or sexual gratification from inflicting pain, suffering, or humiliation on others. Psychodynamic: Pertains to a psychological approach or theory that emphasizes unconscious psychological processes and their influence on human behavior. Voyeurism: A disorder characterized by gaining sexual pleasure from observing unsuspecting individuals who are naked, in the process of disrobing, or engaging in sexual activities.