"As we have shown, a child conceived in lust can no more be chaste by nature than a negro can be a Caucasian. But back of this there is a deeper cause, as we shall see, one that affects parents as well as offspring. Between infancy and puberty, are in operation, all those influenced mentioned under “Sexual Precocity.” The frequent custom of allowing children of the opposite sex to sleep together, even until eight or ten years of age, or longer is a dangerous one. We have known of instances in which little boys of seven or eight have been allowed to sleep with girls of fourteen or sixteen, in some of which most shameful lessons were taught, and by persons who would not be suspected of such an impropriety. In one instance a little boy of eight, occupying the same bed with three girls several years older, was used for illustration by the older girl in instructing the younger ones in the “modus operandi” of reproduction. The sexes should be carefully separated from each other at least as early as four or five years of age, under all circumstances which could afford opportunity for observing the physical differences of the sexes, or in any way serve to excite those passions which at this tender age should be wholly dormant."