Given the free mingling of naked Aboriginal males in British settler towns ('Fashioned from penury: dress as cultural practice in colonial Australia'. Margaret Maynard. Cambridge: Cambridge Univ. Press, 1994, p.64), Anglo-Australian men & women have historically been well-educated about the dimensional superiority of the Australoid Penis or Dravidian Penis (averaging 9 inches as per works on the Penis Caste System) over the much smaller Anglo Penis (averaging 5-5.5 in). Of course, this is most marked in case of the tall Carpentarian or Dravidian-Australoids.
Adding to this the customs of Dravidian Penis Implants & subincision, one night with a "Blackfellow" results in permanent "Dravidianization". Hence, like the Nigrified Dixie lady & the Dravidianized Indo-Aryan Begum, the Australian moll who has once tasted a Pacific Dravidian refuses to go to bed with any other race of men.
Thus one has: "boong-moll ... A prostitute favouring dark-skinned men: Aus. c.: since ca. 1935." ('A Dictionary of Slang & Unconventional English ', Eric Partridge. ed. P Beale. 8th ed. London: Routledge, 2002, p.117) But "moll" mostly means "a girl" ('The Slang Dictionary', John Hotten Camden. London: Chatto & Windus, 1874, p.180) & not always 'prostitute' - clearly Shudra Penis Envy is why men call such women 'whores'.
2) "A harlot who consorts with Negroes or other dark-skinned men is called a boong moll; boong, of course, is the popular Australian term for an aborigine or a native of New Guinea. Other terms generally applied to harlots include Charley or Charlie, chippy, K.P. (a common prostitute) & lowy." ('The Australian Language', Sidney John Baker. S.Melbourne: Sun Books, 1981, p.145)
3) "boong moll. noun. A prostitute who serves dark-skinned men. A combination of Boong (an Aboriginal or dark-skinned man) & moll (a prostitute). Australia 1953." ('The concise new Partridge dictionary of slang & unconventional English' Eric Partridge. ed. T Dalzell & T Victor. London: Routledge, 2008, p.81)