Etymology
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sexual (adj.)

1650s, "distinctive of either sex, of or pertaining to the fact of being male or female," from Late Latin sexualis "relating to sex," from Latin sexus "a sex, state of being either male or female, gender" (see sex (n.)).

The meaning "pertaining to copulation or generation" is from 1766, on the notion of "done by means of the two sexes;" hence also "pertaining to erotic appetites and their gratification" and "peculiar to or affecting the organs of sex, venereal" (1799). The phrase sexual intercourse is attested by 1771 (see intercourse), sexual orientation by 1967, sexual harassment by 1975. Sexual revolution is attested by 1962. Sexual politics is from 1970. Related: Sexually.

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discrimination (n.)

1640s, "the making of distinctions, act of observing or marking a difference," from Late Latin discriminationem (nominative discriminatio), noun of action from past-participle stem of discriminare "to divide, separate" (see discriminate (v.)). Sense of "making invidious distinctions prejudicial to a class of persons" (usually based on race or color) is from 1866 in American English in the language of Reconstruction. Meaning "discernment" is from 1814.

It especially annoys me when racists are accused of 'discrimination.' The ability to discriminate is a precious facility; by judging all members of one 'race' to be the same, the racist precisely shows himself incapable of discrimination. [Christopher Hitchens, "Letters to a Young Contrarian"]
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sexism (n.)

1968; see sexist + -ism. Sex-discrimination is attested from 1916.

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heterosexism (n.)

"discrimination or prejudice against homosexuals," by 1975 in feminist and lesbian writing; see heterosexual + sexism. Related: Heterosexist (1977).

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speciesism (n.)

"discrimination against certain animals based on assumption of human superiority," first attested 1975 in Richard D. Ryder's "Victims of Science," from species + -ism.

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ageism (n.)

"discrimination against people based on age," coined 1969 by U.S. gerontologist Dr. Robert N. Butler (1927-1910), from age (n.) + -ism, on pattern of racism, sexism. Related: Ageist.

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venereal (adj.)

early 15c., "of or pertaining to sexual desire or intercourse," from Latin venereus, venerius "of Venus; of sexual love," from venus (genitive veneris) "sexual love, sexual desire" (from PIE root *wen- (1) "to desire, strive for"). Used of sexually transmitted diseases from 1650s. Related: Venereally.

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venery (n.1)

"pursuit of sexual pleasure," mid-15c., from Medieval Latin veneria "sexual intercourse," from Latin venus (genitive veneris) "sexual love, sexual desire" (from PIE root *wen- (1) "to desire, strive for"). In earlier use it may have been felt as a play on now obsolete homonym venery (n.2) "practice or sport of hunting, the chase." Related: Venereous.

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sexualize (v.)

also sexualise, 1839, "confer a sexual distinction upon" (a thing, idea, etc.), from sexual + -ize. Related: Sexualized; sexualizing.

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psychosexual (adj.)

also psycho-sexual, "involving the mental and emotional aspects of sexuality," 1891, from psycho- + sexual. Related: Psychosexually.

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