The chapter introduces a model that describes the conditions influencing gender-related behavior, emphasizing the variability, proximal causes, and context dependence of such behavior. The model integrates perspectives from expectancy confirmation processes, self-verification, and self-presentation strategies. It posits that gender-related behaviors are influenced by perceivers' expectations, the target's self-system, and situational cues. The model is presented as a supplement to existing models of sex differences, highlighting the importance of immediate influences rather than distal factors. The authors argue that gender-related behaviors are highly flexible and context-dependent, influenced by the interplay between perceivers' expectations, targets' self-conceptions, and situational factors. The model is supported by research and offers suggestions for future development.The chapter introduces a model that describes the conditions influencing gender-related behavior, emphasizing the variability, proximal causes, and context dependence of such behavior. The model integrates perspectives from expectancy confirmation processes, self-verification, and self-presentation strategies. It posits that gender-related behaviors are influenced by perceivers' expectations, the target's self-system, and situational cues. The model is presented as a supplement to existing models of sex differences, highlighting the importance of immediate influences rather than distal factors. The authors argue that gender-related behaviors are highly flexible and context-dependent, influenced by the interplay between perceivers' expectations, targets' self-conceptions, and situational factors. The model is supported by research and offers suggestions for future development.