Problem: Henry Havelock Ellis, known as Havelock Ellis (2 February 1859 - 8 July 1939), was an English physician, writer, progressive intellectual and social reformer who studied human sexuality. He co-authored the first medical textbook in English on homosexuality in 1897, and also published works on a variety of sexual practices and inclinations, as well as on transgender psychology. He is credited with introducing the notions of narcissism and autoeroticism, later adopted by psychoanalysis. Ellis was among the pioneering investigators of psychedelic drugs and the author of one of the first written reports to the public about an experience with mescaline, which he conducted on himself in 1896.

Ellis returned to England in April 1879. He had decided to take up the study of sex, and felt his first step must be to qualify as a physician. He studied at St Thomas's Hospital Medical School now part of King's College London, but never had a regular medical practice. His training was aided by a small legacy and also income earned from editing works in the Mermaid Series of lesser known Elizabethan and Jacobean drama. He joined The Fellowship of the New Life in 1883, meeting other social reformers Eleanor Marx, Edward Carpenter and George Bernard Shaw. The 1897 English translation of Ellis's book Sexual Inversion, co-authored with John Addington Symonds and originally published in German in 1896, was the first English medical textbook on homosexuality. It describes the sexual relations of homosexual males, including men with boys. Ellis wrote the first objective study of homosexuality, as he did not characterise it as a disease, immoral, or a crime. The work assumes that same-sex love transcended age taboos as well as gender taboos. In 1897 a bookseller was prosecuted for stocking Ellis's book. Although the term homosexual is attributed to Ellis, he wrote in 1897, "'Homosexual' is a barbarously hybrid word, and I claim no responsibility for it." Ellis may have developed psychological concepts of autoerotism and narcissism, both of which were later developed further by Sigmund Freud. Ellis's influence may have reached Radclyffe Hall, who would have been about 17 years old at the time Sexual Inversion was published. She later referred to herself as a sexual invert and wrote of female "sexual inverts" in Miss Ogilvy Finds Herself and The Well of Loneliness. When Ellis bowed out as the star witness in the trial of The Well of Loneliness on 14 May 1928, Norman Haire was set to replace him but no witnesses were called.

so he studied medicine but never had a practice becaue of the sex clinics?

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John William Money (8 July 1921 - 7 July 2006) was a psychologist, sexologist and author, specializing in research into sexual identity and biology of gender. He was one of the first scientists to study the psychology of sexual fluidity and how the societal constructs of "gender" affect an individual. More recent academic studies have criticized Money's work in many respects, particularly in regards to his involvement with the sex-reassignment of David Reimer and his eventual suicide. Money's writing has been translated into many languages, and includes around 2,000 articles, books, chapters and reviews.
In this book (Oxford 1988: 116), Money develops a conception of 'bodymind,' as a way for scientists, in developing a science about sexuality, to move on from the platitudes of dichotomy between nature versus nurture, innate versus the acquired, biological versus the social, and psychological versus the physiological. He suggests that all of these capitalize on the ancient, pre-Platonic, pre-biblical conception of body versus the mind, and the physical versus the spiritual. In coining the term "bodymind", in this sense, Money wishes to move beyond these very ingrained principles of our folk or vernacular psychology. Money also develops here (Oxford 1988: 114-119) a view of "Concepts of Determinism," which, transcultural, transhistorical, and universal, all people have in common, sexologically or otherwise. These include pairbondage, troopbondage, abidance, ycleptance, foredoomance, with these coping strategies: adhibition (engagement), inhibition, explication. Money suggests that the concept of threshold (Oxford 1988: 115) - the release or inhibition of sexual (or other) behavior - is most useful for sex research as a substitute for any concept of motivation. Moreover, it confers the distinct advantage of having continuity and unity to what would otherwise be a highly disparate and varied field of research. It also allows for the classification of sexual behavior. For Money, the concept of threshold has great value because of the wide spectrum to which it applies. "It allows one to think developmentally or longitudinally, in terms of stages or experiences that are programmed serially, or hierarchically, or cybernetically (i.e. regulated by mutual feedback)." (Oxford 1988: 116)
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What were the concepts of determinism?

Answer:
which, transcultural, transhistorical, and universal, all people have in common, sexologically or otherwise.