missionary (n.)youdaoicibaDictYouDict[missionary 词源字典]
1650s, from missionary (adj.). Missionary position attested by 1963, said to have been coined by Kinsey (1948), who identified its origin in work done by Polish anthropologist Bronisław Malinowski in Melanesia in the 1920s; allegedly from the term used by South Pacific peoples to describe what Christian missionaries promoted to replace their local variations. By late 1960s it became the general term for this type of sex, formerly also known as the English-American position.[missionary etymology, missionary origin, 英语词源]
oral (adj.)youdaoicibaDictYouDict
1620s, from Late Latin oralis, from Latin os (genitive oris) "mouth, opening, face, entrance," from PIE *os- "mouth" (cognates: Sanskrit asan "mouth," asyam "mouth, opening," Avestan ah-, Hittite aish, Middle Irish a "mouth," Old Norse oss "mouth of a river," Old English or "beginning, origin, front"). Psychological meaning "of the mouth as the focus of infantile sexual energy" (as in oral fixation) is from 1910. The sexual sense is first recorded 1948, in Kinsey. As a noun, "oral examination," attested from 1876. Related: Orally (c. 1600); orality. Os was the usual word for "mouth" in Latin, but as the vowel distinction was lost it became similar in sound to os "bone" (see osseous). Thus bucca, originally "cheek" but used colloquial as "mouth," because the usual word for "mouth" (see bouche).
perversion (n.)youdaoicibaDictYouDict
late 14c., "action of turning aside from truth, corruption, distortion" (originally of religious beliefs), from Latin perversionem (nominative perversio) "a turning about," noun of action from past participle stem of pervertere (see pervert (v.)). Psychological sense of "disorder of sexual behavior in which satisfaction is sought through channels other than those of normal heterosexual intercourse" is from 1892, originally including homosexuality.
Perversions are defined as unnatural acts, acts contrary to nature, bestial, abominable, and detestable. Such laws are interpretable only in accordance with the ancient tradition of the English common law which ... is committed to the doctrine that no sexual activity is justifiable unless its objective is procreation. [A.C. Kinsey, et.al., "Sexual Behavior in the Human Male," 1948]