For my part, I think rather that the jealousy natural to both sexes has gradually compelled them to limit their sexual intercourse to intimacy and to conceal it. But man is ashamed of everything which he conceals, and we shall soon see that the sentiment of modesty concerns all parts of the body which are concealed. This simple fact is sufficient to give rise to the idea that coitus is impure, and I do not think it necessary to seek any further explanation. ADVANCES MADE BY ONE SEX TO THE OTHER--DEMANDS IN MARRIAGE A natural law compels the male germinal cell to move toward the egg; exceptions to this law are rare, the female germinal cells being larger and produced in less number. It follows that in copulation, or the union of individual sexual entities, man included, it is the male which is the active party and makes the advances. Among certain tribes (Paraguayans, Garos, Moquis), however, it is the female who makes the advances. Everyone knows the combats for the female which takes place between the male of animals, cocks and stags for example. Among certain Indians similar struggles are also observed, after which the vanquished has to surrender his wife to the conqueror. The same custom obtained among the ancient Greeks, as we see in the suitors for Penelope. In Ireland similar customs prevailed up to the last few centuries. On the other hand, we often see among savages and among birds the favors of the female obtained by assiduous courtship rather than by combat. In some savage tribes struggles take place between the females for possession of the male. However, it is usually coquetry in all its degrees which furnishes woman with the basis for her advances. In many nations, if not in most, women have the right to refuse a demand for marriage. METHODS OF ATTRACTION =Adornment in the Two Sexes.=--Vanity is older than man, for it is found in many animals. The lowest and most savage peoples adorn themselves. Tattooing, staining the skin, rings on the arms and feet, in the lips, nose and ears serve to attract one sex toward the other. A Santal woman may carry as much as fifteen kilogrammes of ornaments on her body. Vanity leads to incredible eccentricities, certain tribes, for example, pull out their teeth to increase their attractions. Absurdities of this kind are often associated with religious ideas, although the latter generally play a secondary part. The true origin of these customs lies in vanity, combined with the sexual desire to captivate. In hot climates, at any rate, the savages only commenced to cover their bodies with clothes with the object of pleasing by personal adornment. The religious observances attached to the custom of adornment are not primitive. The latter is derived from the sexual appetite and from vanity, and has only been incorporated in the dogmas of religious mysticism after being first established in the habits of the people.