Three Contributions to the Theory of Sex

There is only one way to obtain a thorough and unerring solution of problems in the sexual life of so-called psychoneurotics (hysteria, obsessions, the wrongly-named neurasthenia, and surely also dementia præcox, and paranoia), and that is by subjecting them to the psychoanalytic investigations propounded by J. Breuer and myself in 1893, which we called the "cathartic" treatment

He who experiences pleasure by causing pain to others in sexual relations is also able to experience the pain emanating from sexual relations as pleasure.

the sexual object causes much pleasure and produces a supply of new excitement.