...aesthetic values are changed under the influence of sexual emotion; from the lover's point of view many things are beautiful which are unbeautiful from the point of view of him who is not a lover, and the greater the degree to which the lover is swayed by his passion the greater the extent to which his normal aesthetic standard is liable to be modified.

It is only the great men who are truly obscene. If they had not dared to be obscene, they could never have dared to be great.

Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not yet clearly understood. It is not necessarily connected with sex, nor is sex necessarily connected with reproduction.

Still, whether we like it or not, the task of speeding up the decrease of the human population becomes increasingly urgent.

If men and women are to understand each other, to enter into each other's nature with mutual sympathy, and to become capable of genuine comradeship, the foundation must be laid in youth.

Birth-control is effecting, and promising to effect, many functions in our social life.

Imagination is a poor substitute for experience.