(2) Man has lost the restraint of seasonal marriage, common to the anthropoids with other animals, as determined by food-supply and other conditions of infantile welfare; though, according to Prof. Westermarck, traces of it may still be found in a few tribes.[13] That our domestic carnivores have also lost this wholesome restraint on passion and population points, probably, to some condition of a steadier food-supply as determining or permitting the change amongst ourselves. No growth of prudence, however, or habit of laying up stores can explain the steadier supply of food; since the lower savages have no prudence and no stores. On the whole, the change may be attributed (_a_) to an omnivorous habit being more steadily gratified than one entirely frugivorous or carnivorous; (_b_) to our ancestors having wandered in quest of game from country to country in which the seasons varied, so that the original correspondence of birth-time with favourable conditions of welfare was thrown out. There may also have been causes that kept down the normal numbers of the pack, so as to be equivalent, in scarce seasons, to more abundant food: the hunter’s life, whilst securing a richer normal diet, involved many destructive incidents. And this (by the way) was favourable to rapid selection and adaptation; though if the destruction had been great enough to counterbalance the advantages of animal food, it must have frustrated the whole experiment. (3) There is one characteristic difference of Man from the anthropoids which his hunting habits do not clearly explain—his relatively naked skin. Darwin attributed this condition to sexual selection.[14] He argued that, on the one hand, so far as Man has had the power of choice, women have been chosen for their beauty; and that, on the other hand, women have had more power of selection, even in the savage state, than is usually supposed, and “would generally choose not merely the handsomest men, according to their standard of taste, but those who were at the same time best able to defend and support them.” Hence, if a partial loss of hair was esteemed ornamental by our ape-like progenitors, sexual selection, operating age after age, might result in relative nakedness. “The faces of several species of monkey and large surfaces at the posterior end of the body have been denuded of hair; and this we may safely attribute to sexual selection.” The beard of the male, and the great length of the hair of the head in some races, especially seem due to this cause. The greater hairiness of Europeans, compared with other races, may be a case of reversion to remote ancestral conditions. But as all races are nearly naked, the common character was probably acquired before the several races had diverged from the common stock.