The Great South African Sex Survey was conducted online on the Health24 website between mid-December 2007 and 31st January 2008, and attracted just under 11 000 entries.
The results were weighted to reflect the dominant demographic, which is urban adults, educated to matric level or higher (one in four have tertiary education degrees or diplomas).
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Just under two thirds are aged 25-49, with the remaining third falling on either side of this age group; and about half have English or Afrikaans as their home language, with the balance being made of those whose home language was one of South Africa's other national languages.
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