Boys & the facination with #2

We've been working a lot on potty issues with the boys and "poop" has come up quite a bit in discussion. To add to the fun, today when the boys were playing with the Play-doh kit that Santa brought they figured out how to create their very own excrement!

Here is a picture of their creation.

Is this the tip of the iceberg with them, and is it just something that only boys are into?