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In this fascinating paper the author combines research data and speculations to elucidate some of the findings on the neuroanatomical bases for sexual, oral, and aggressive functions. In the squirrel monkey, the findings suggest that thalamic structures involved in ejaculation and genital sensation lie close to and probably articulate with those that are nodal to penile erection. Parts of the amygdala are involved in oral functions. These are close to the structures mentioned above. Stimulating parts of the amygdala leads to both oral and erectile responses, thus attesting to the close organization of oral and sexual functions in the brain. There is also evidence that these structures are juxtaposed with those concerned with fearful and combative behavior. These findings may help in understanding the interplay of oral, aggressive, and sexual behavior. Some naturalistic observations on display of penile erection in the squirrel monkey with its connection between courtship and aggression are also linked with Freud's comments on the looking and cruelty components of sexual impulses in children. MacLean suggests the interesting speculation that the use of the loin cloth arose from the necessity in a social group to reduce the tension created by the show of these aggressive impulses.