The practice of self-stimulation of the genitals for sexual pleasure, often referred to as masturbation. The book discussed various aspects of human sexuality, including the topic of onanism.
A term used to describe self-indulgence or self-gratification, often in a non-sexual context. His constant focus on personal achievements was seen as a form of intellectual onanism.
Coitus interruptus; the practice of withdrawing the penis before ejaculation during sexual intercourse. Before modern contraception, some couples relied on onanism as a means to avoid pregnancy.