Various versions of the Immorality Act, 1957 or Sexual Offences Act, 1957 exist:
- as enacted on 12 April 1957 as the Immorality Act, 1957.
- as amended on 1 June 1967 by the Immorality Amendment Act, 1967.
- as amended on 21 May 1969 by the Immorality Amendment Act, 1969.
- as amended on 19 June 1985 by the Immorality and Prohibition of Mixed Marriages Amendment Act, 1985.
- as amended on 4 March 1988 and renamed the Sexual Offences Act, 1957, by the Immorality Amendment Act, 1988.
- as amended on 11 March 1992 by the Criminal Law Amendment Act, 1992.
- as amended on 7 August 1992 by the General Law Amendment Act, 1992.
- as amended on 1 December 1993 by the General Law Fourth Amendment Act, 1992.
- as amended on 16 December 2007 by the Criminal Law (Sexual Offences and Related Matters) Amendment Act, 2007, and currently in force.