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Matthew R. Reynolds, Jon T. Willie, Gregory J. Zipfel and Ralph G. Dacey Jr.

rupture. In this manner, we attempt to elucidate the specific changes in sexual physiology that promote aneurysmal SAH. Coital Physiology Phases of Sexual Intercourse In the late 1950s at Washington University in St. Louis, Masters and Johnson 63 conducted a series of controversial experiments to record physiological variables from male and female individuals during coitus. These experiments showed that during sexual excitement, both sexes exhibit radical changes in hemodynamic, ventilatory, and myotonic patterns ( Table 1 ). Masters and Johnson characterized