In the 20th century,investigations of sexual disorders and the physiology of sexual response were conducted by

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Masters and Johnson conducted pioneering research on sexual disorders and the physiology of sexual response in the 20th century, including the famous "Masters and Johnson Study" which involved observing and measuring physiological responses during sexual activity. The other options listed were important figures in the history of science, but they did not specifically focus on sexual disorders and physiology. Anton van Leeuwenhoek was a microbiologist who made important discoveries in the field of microscopy, including the first observations of sperm cells. Oskar Hertwig was a biologist who contributed to the understanding of cell division and reproductive biology. Richard von Krafft-Ebing was a psychiatrist who wrote extensively on sexual deviance and paraphilias, while Gregor Mendel was a monk and geneticist who studied inheritance in pea plants.

In the 20th Century,investigations of Sexual Disorders and the Physiology