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15We are far from understanding sex-related differences in spatial-mathematical abilities despite the theory of sexual selectionBehavioral and Brain Sciences 19 (2): 264-264. 1996.I have provided evidence that Geary's model does not explain male dominance in spatial abilities by sexual selection. The current literature concerning the relations of nonverbal IQ to testosterone, hand preference, and right- and left-hand skill, as well as the organizing effects of testosterone on cerebral lateralization during the perinatal period, does not support Geary's arguments.