This is a weird way to cum! Why is it happening?

I think I might have an over sensitive G-Spot. I have a really weird way of making myself cum so I guess it's a form of masturbation. It's been happening since I was 15 years old now I'm 25 and its still the same. Here is a video I posted that shows what I mean:

http://chufter.com/view_video.php?v...8c11a970fbe0e2a

Can anyone else do this or tell me why it's happening? Please email me at cutemikeyboy@gmail.com - thanks

 

Don't watch this unless you want to see a pervert take a shit.

 

I'm hoping there is a medical explanation for this. I'm not just a pervert

 

Dude, why are you posting this in every single fucking forum?