Question: The four major figures often cited as foundational sex researchers, shaping early understandings of sexuality, are Richard von Krafft-Ebing, Sigmund Freud, Havelock Ellis, and Alfred Kinsey, each contributing different theoretical or empirical perspectives that advanced the field from clinical pathology to broad societal study. Later pioneers include William Masters & Virginia Johnson, who focused on physiological responses. Which theories are they known for? Explain the theories. How have they contributed in and advanced the field of sex research? Do you think they were addressing the most fundamental questions about sex and sexuality through their research? Do you think the fundamental questions have changed with changing times and can these theories be extended to accommodate changing sexual behavior? Need Assignment Help?