Hahah! Reading this made me so curious about the connection I also googled it. This article was 5th on the google ranking for my search! Also I found this I thought you might enjoy if you didn’t already encounter it: http://www.collegehumor.com/post/6997465/10-reasons-why-it-would-suck-if-your-dick-were-an-actual-anaconda

But aside from a comment that it makes sense to use snake references because of the shape, I didn’t find the source either.