[Solved] The structural-functional theory proposes that much of consumer behavior can be explained by the match between a consumer's self-concept and the image of typical users of a focal product. Oral Sex: Sexual activity involving the stimulation of the genitalia of a partner using the mouth. Committed Relationship: A long-term partnership between individuals where there is mutual affection, trust, and support. Opportunity Arises: The emergence of a situation or condition that makes it possible to do something or for something to happen. Erotic Plasticity: Definition: The degree to which one's sex drive can be changed by sociocultural and situational factors.