Ernest John Eitel controversially claimed that most "half-caste" people in Hong Kong were descended exclusively from Europeans having relationships with Tanka women. The theory that most of the Eurasian mixed-race Hong Kong people are descended only from Tanka women and European men, and not ordinary Cantonese women, has been backed up by other researchers who pointed out that Tanka women freely consorted with foreigners because they were not bound by the same Confucian traditions as the Cantonese, and having relationships with European men was advantageous for Tanka women, but Lethbridge criticized it as "a 'myth' propagated by xenophobic Cantonese to account for the establishment of the Hong Kong Eurasian community". Carl Smith's study in the late 1960s on the protected women seems, to some degree, to support Eitel's theory. Smith says that the Tankas experienced certain restrictions within the traditional Chinese social structure. Being a group marginal to the traditional Chinese society of the Puntis (Cantonese), they did not have the same social pressure in dealing with Europeans. The ordinary Cantonese women did not sleep with European men; the Eurasian population was formed mostly from Tanka and European admixture.