According to Darcy Ribeiro the process of miscegenation between whites and blacks in Brazil, in contrast to an idealized racial democracy and a peaceful integration, was a process of sexual domination, in which the white man imposed an unequal relationship using violence because of his prime condition in society. As an official wife or as a concubine or subjected to a condition of sexual slave, the black woman was the responsible for the growth of the "parda" population. The non-White population has grown mainly through sexual intercourse between the black female slave and the Portuguese master, which, together with assortative mating, explains the high degree of European ancestry in the black Brazilian population and the high degree of African ancestry in the white population.