[Solved] A mother's immune system may have a defensive response to substances produced by male fetuses. This is most likely to contribute to A) erotic plasticity. B) orgasmic disorder. C) sexually transmitted infections. D) the fraternal birth-order effect. Milgram's Study: A psychological experiment conducted by Stanley Milgram to measure the willingness of study participants to obey an authority figure who instructed them to perform acts conflicting with their personal conscience. Psychological Distance: The perception of how far away an object, event, or person is from oneself, psychologically, rather than physically. Obedience: the act of following orders or directives from an authority figure, often studied in psychology to understand social influence and control. Maximum Shock Intensity: The highest level of electric shock that can be safely administered to a subject in a controlled setting.