Used to do it when I was a kid but not now. I think many women/girls do it becoz some of my female class fellows do it all the time during the class.
I do. It's a terrible, terrible habit but as I've been doing it for the last 20 years I doubt I'll be able to break it in a hurry.
If you do: NASTY! I think all kids have at one time or another but as an adult...that's "issues" right there
yeah I do, mostly when i'm watching a film and I get nervous of whats going to happen (this is one reason why I don't like horror films, the other is that i'm jumpy)