What's the Science Behind Ass Milk?

I've just seen numerous porn videos of girls shooting milk out of their assholes and I'd like to know, well... what's up with that? Squirting was hard enough to get my head around...

Here's an animated gif of it happening in action: http://images.heaven666.org/images/beautiful-ass-milk-fontain.gif

>>6
Just because you said it, a /b/tard is going to assfeed their child some day.  Good job, anon.