Adrenaline Rushes

On my lunch break today I went to have one of my tattoos embellished. While there I had a interesting conversation with the artist "T". We first talked about how men act getting tattos alone vs with their girlfriends. This lead to talking about why people do things like get tattoos. I found it very interesting to hear T's observation on the first subject and thought I would share it.

He has been tattooing for 10+ years and has always found it interesting that men who get tattooed alone or with other men act tough or just get their tattoos without fuss. But when women are around they, (and I am just generalizing here) fuss and moan and whine. Why is that and wouldn't you think that it would be the opposite?

Now about why we do the things we do. Why is it that some people live to ride a roller coaster over and over again? What was it in our development that gave this person the need to bungy jump off a bridge that another person can not even walk on? Where does our need for these adreanline rushes come from and why do we develop them?