Ask Mark 4.6 - High risk experiences

Ask Mark 4.6 - High risk experiences
Professor Mark Solms from the University of Cape Town (UCT) a question (see below) posed to him on UCT's free online course, "What is a Mind?", hosted by FutureLearn. For more information on visit bit.ly/1JB2Dxf .
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Question: How do we explain the apparently counter-productive behaviour of seeking high risk experiences such as climbing Mount Everest or walking across Niagara Falls on a narrow tight rope extended high above the cascading falls - these acts obviously do not enhance human survival or reproduction?