Ideal Marriage: Its Physiology and Technique is a famous popular scientific treatise and self-help book published in London in 1926 by Dutch gynecologist Theodoor Hendrik van de Velde, retired director of the Gynecological Clinic in Haarlem, and "one of the major writers on human sexuality during the early twentieth century" (Frayser & Whitby, p. 300). It was the best-known work on its subject for several decades, and was reprinted 46 times in the original edition. After World-War Two, it sold over a half-million copies. A revised edition was published in 1965. and a subsequent one in 2000 (Melody & Pearson, p. 96).