κοίτη derives from κεῖμαι ("to lie") and its semantic center is a place for lying: a bed or bedstead (Homer Od. 19.341 onward), and by extension a lair, nest, lodging, animal pen, or plot of land in the documentary papyri, which never attest a sexual sense (Moulton-Milligan). The euphemistic use for sexual intercourse is a literary development, nascent in Euripides (Ion 892) but decisively established in Hellenistic Jewish Greek. In the Septuagint κοίτη occurs roughly 81 times, chiefly rendering Hebrew מִשְׁכָּב and secondarily שְׁכָבָה, and it carries the specialized cultic phrase κοίτη σπέρματος in the Levitical purity code (Lev 15:16-17; 18:20; 22:4). BDAG (3rd ed., 554) organizes the range under two macro-senses, a place for sleeping and the act of intercourse, the latter subdivided into the marriage bed (Heb 13:4), sexual excess in the plural (Rom 13:13), seminal emission, and conception (κοίτην ἔχειν, Rom 9:10); LSJ (9th ed.) lays out six divisions; TDNT 3 (Christian Maurer) treats the LXX cultic use as distinctive; Louw-Nida distribute it across furniture (6.106), sexual relations (23.62), and the idiom for conceiving. The word's wider significance is that it is the second element of ἀρσενοκοίτης (1 Cor 6:9; 1 Tim 1:10), a compound almost certainly compressed out of the adjacent ἄρσενος + κοίτην of LXX Lev 18:22 and 20:13. David F. Wright (VC 38 [1984]: 125-153; VC 41 [1987]: 396-398) established the majority derivation, in which the compound's -κοίτης element keeps its full sexual force; the reading is endorsed across the spectrum by Gagnon, Hays, Fee, Thiselton, Harper, Nissinen, and, though personally sympathetic to gay Christians, Loader and Brooten, against the revisionist proposals of Boswell and Dale Martin. That contested reception concerns the compound and its ethics, not the sense of κοίτη itself, which is lexically settled.