Flexibility

There is something erotic about someone who is very flexible or agile. There is the common fantasy about being with a gymnast or a dancer. However there is also something scary about someone who is flexible to the point of being a contortionist. The video below is a very extreme example of this. I find it incredibly erotic (I'm not sure how old she is, so I'm just basing this reaction on her ability to control her body) and yet at the same time, mildly disturbing.