[Solved] Before the Sixteenth Amendment to the Constitution was ratified, there was no valid Federal income tax on individuals. Steroid Hormone Cortisol: A hormone produced by the adrenal glands that plays a vital role in the body's response to stress, metabolism, and immune response. Erotic Attraction: A type of physical or sexual attraction to another person, characterized by desire and arousal. Affectional Relationships: Relationships characterized by a fondness and love towards another person, often distinguished by emotional intimacy and closeness. Sexual Behavior: Activities related to physical intimacy and reproduction, including sexual acts and expressions of sexual attraction.