Why do I keep doing this?

So I am a bit of an adreniline junkie. I like to engage in activities that may kill me. In the Victoria Falls area, I did a smorgasbord of potentially dangerous acts including Abseiling, Zip Wire, Gorge Swing and my favourite, the bungi jump off the Victoria Falls Bridge. I didn't really hurt myself doing all of these. Although the gorge swing is a bit rough on a very senisitive part of the anatomy and the bouncing from the bungi jump kind of throws your bones and muscles around into new postitions. I lived.