[Solved] A value of ________ is used when a value is missing, unknown, or inapplicable. Erotic Plasticity: The degree to which the sex drive can be shaped and altered by social, cultural, and situational forces. Coolidge Effect: The sexually arousing power of a new partner (greater than the appeal of a familiar partner). Excitation Transfer: The process whereby arousal generated in one context is carried over and intensifies emotional reactions in another context. Sexual Attraction: The natural or inherent interest in or desire for someone, often based on physical, emotional, or psychological factors.