“It is said a fish as large as a man has a brain no larger than the kernel of an almond. In all fish and reptiles where there is no great brain development, there is also no conscious sexual control. The lower down in the scale of human development we go the less sexual control we find. It is said that the aboriginal Australian, the lowest known species of the human family, just a step higher than the chimpanzee in brain development, has so little sexual control that police authority alone prevents him from obtaining sexual satisfaction on the streets. According to one writer, the rapist has just enough brain development to raise him above the animal, but like the animal, when in heat knows no law except nature which impels him to procreate whatever the result. Every normal man and Woman has the power to control and direct his sexual impulse. Men and women who have it in control and constantly use their brain cells in thinking deeply, are never sensual.”

Source: What Every Girl Should Know (1913), Chapter 4, "Sexual Impulses--Part II", p. 47.