Time to Marry.-Physiology fixes with accuracy the earliest period at which marriage is admissible. This period is that at which the body attains comp… - John Harvey Kellogg

The debilitating effects of excessive sexual indulgence arise from two causes; viz, the loss of the seminal fluid, and the nervous excitement. With reference to the value of the spermatic fluid, Dr. Garner remarks: “The sperm is the purest extract of the blood. . . . . Nature, in creating it, has intended it not only to communicate life, but also to nourish the individual life. In fact, the re-absorption of the fecundating liquid impresses upon the entire economy new energy, and a virility which contributes to the prolongation of life.”

In order to make more clear and comprehensible the teachings of nature respecting the laws regulating the sexual function, and the evils resulting from their violation, it has seemed necessary to preface the practical part of the subject by a concise description of the anatomy of reproduction. In this portion of the work especial pains has been taken to avoid anything like indelicacy of expression yet it has not been deemed advisable to sacrifice perspicuity of ideas to any prudish notions of modesty. It is hoped that the reader will bear in mind that the language of science is always chaste in itself, and that it is only through a corrupt imagination that it becomes invested with impurity.

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.