Extreme Base Jumping in Wingsuits

This clip features interviews with base jumpers and a great deal of footage of their feats. At the beginning of the clip, one of them states that just staying clear of the mountains and cliffs was getting boring, so now they challenge themselves to get as close as possible without actually crashing.

What is the Sensation Seeking Scale?

What types of questions does it ask? Are people who do things like base jump more likely to engage in other risky behaviors?