According to "Live Science" graff writers (and skydivers) do it to attract mates...
"Men make up four-fifths of the world's skydivers and two-thirds of all rock climbers, and a new study suggests they do it for more than just the thrill.
"Men may flirt with risk because they think it will help them score women..."
rest of the story at --
http://www.livescience.com/culture/081219-sex-risks.html
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