Subsequent legislation, especially the Population Registration and Immorality Acts of 1950, facilitated its implementation by requiring all individuals living in South Africa to register as a member of one of four officially defined racial groups and prohibiting extramarital sexual relationships between those classified as "white" on the one hand and those classified as "non-White" (Blacks, Coloureds, later also Asians) on the other.
[4] The punishment for people found to be in a mixed marriage involved arrest and a jail sentence.
Anyone who knowingly officiated a marriage that violated the act was also subject to a punishment: a fine was imposed not exceeding 50 pounds.
[4] Some of the social consequences of entering into a mixed-race marriage included being ostracised from or ridiculed by one's family and community.
These numbers had dropped to 187 people prosecuted and 97 convicted in 1980, with increased leniency shown towards Indians and Coloureds.