In marital relationships, exclusivity expectations are commonly assumed although they are not always met.
Results, however, vary year by year, and also by age-group surveyed.
For example, one study conducted by the University of Washington, Seattle found slightly, or significantly higher rates of infidelity for populations under 35, or older than 60.
Last year a Kuils River magistrate found Carolissen was liable to be extradited to the US. In papers before the High Court, it emerged Carolissen allegedly sexually abused a young girl in South Africa.
He produced images of the abuse, then distributed them via the internet.
The court was informed of additional investigations which established that Dickens was Carolissen.
He is sought to stand trial in the Federal Court in Maine on charges of sexual exploitation of a minor and the transportation of child pornography into the US.
The 40-year-old was arrested in Cape Town in 2014 at the request of the US government, before a formal extradition request was received.
He was sent to Valkenberg Psychiatric Hospital for observation and a panel found he was not mentally ill, but that he fulfilled the criteria for a diagnosis of paedophilia, having reported a long-standing sexual attraction to children.
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