Etymology: The word was current in the early to mid-1960s, before the black power movement replaced the word "Negro" with "Afro-American" and "Black" in polite conversation. The word is featured in the title of Guy D. St. Lazare's 1966 pulp novel "The Young Negrosexuals".
"What were they called?"
"They were called: THE YOUNG NEGROSEXUALS"
-- jacket blurb from G.D. St. Lazare's novel "The Young Negrosexuals" (New York: Berkely Original, 1966)