The modesty of women, which, in its most primitive form among animals, is based on sexual periodicity, is, with that periodicity, an essential condition of courtship.

On the threshold of the moral world we meet the idea of Freedom, 'one of the weightiest concepts man has ever formed,' once a dogma, in the course of time a hypothesis, now in the eyes of many a fiction, yet we cannot do without it, even although we may be firmly convinced that our acts are determined by laws that cannot be broken.

Imagination is a poor substitute for experience.

The sexual regions constitute a particularly vulnerable spot, and remain so even in man, and the need for their protection which thus exists conflicts with the prominent display required for sexual allurement. This end is far more effectively attained, with greater advantage and less disadvantage, by concentrating the chief ensigns of sexual attractiveness on the upper and more conspicuous parts of the body. This method is well-nigh universal among animals as well as in man.

The husband - by primitive instinct partly, certainly by ancient tradition - regards himself as the active partner in matters of love and his own pleasure as legitimately the prime motive for activity.

For every fresh stage in our lives we need a fresh education, and there is no stage for which so little educational preparation is made as that which follows the reproductive period.

What we call 'morals' is simply blind obedience to words of command.