The three subcommunities of Macau— the Portuguese, Macanese, and Chinese—have traditionally intermingled, but as the population grew and the Chinese population became more predominant, intermarriage declined. The Portuguese and Macanese had formal monogamous marriage, while the Chinese also engaged in polygamous unions until the 1940s (depending on the economic situation of the husband). Weddings are important and costly occasions for celebration in both the Portuguese and Chinese communities.

Source: http://www.everyculture.com/Ja-Ma/Macau.html