[Solved] Any material used in or produced by a chemical reaction is a ________. 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.