The original is relevant because 1) it is valentine's day and 2) most people here appreciate a good math formula.

On it's own the original post was perhaps not too original, but it spurred some interesting discussion, like where the heart shape originated.

The penis graph on the other hand, only comes of as childish. Sure, it would have been really funny when I was 15. And to be sure, there are plenty of clever penis jokes out there ("The hammer is my penis" comes to mind), but this is not one of them.