hothouse (n.)youdaoicibaDictYouDict
mid-15c., "bath house," from hot + house (n.). In 17c. a euphemism for "brothel" (similar to massage parlor); the meaning "glass-roofed structure for raising plants" is from 1749. Figurative use by 1802.
massage (n.)youdaoicibaDictYouDict
1874, from French massage "friction of kneading," from masser "to massage," possibly from Arabic massa "to touch, feel, handle;" if so, probably picked up in Egypt during the Napoleonic campaign there. Other possibility is that French got it in colonial India from Portuguese amassar "knead," a verb from Latin massa "mass, dough" (see mass (n.1)). Massage parlor first attested 1894, from the start a euphemism for "house of prostitution."