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Synopsis This book is an analytical study of the mechanism, manifestation, and menstruation of sexual deviation, sexual impulse, and sexual periodicity. These sexual impulses are commonly known as sexual perversions, but they are also recognized as a natural sexual behaviour. These manifestations are quite normal and even very necessary. Therefore, one should be extremely careful in terming the phenomenon of sexual impulse as an abnormal one; because the real abnormality would be the appearance of the developed adult impulse at the infantile stage. These work is equally concerned with the influence of cosmic rhythm on menstruation. The general tendency of nervous action to fall into rhythm basically demonstrates a biological predisposition to accept any periodicity that is habitually imposed upon the orgasm.