There is a book put out by Survival Research Labratories called "Modern Primitives". It was actually a text we used in an Art History course in college. Inside said book is a lovely pic of a man who had this proceedure done. It's a great book of you're into body modification.

Bbbut splitting his penis?! Then there's the mechanical questions, how does he pee and such?!
It's something I never could have even dreamed of being in the realm of possibilities!! I'm flustered, I....I don't know

Click at your own risk.

By the by, I actually liked the swan dress. I thought it was kitschy and ballsy.

The guy in the "Modern Primitives" book actually had it split down the middle and has, in effect, 2 smaller penises. I guess they both function sexually and he says they are more pleasurable for women.

The king of the Modern Primitives is Fakir Musafar. His web site is here (and probably NSFW).

The penis is essentially just three wobbly bits that merged and so separation of the whole into two or three pieces isn't really that complex so long as it is done with care.

My view is that I have enough trouble with my pits and pieces getting themselves into uncomfortable positions in my clothes or as I sit/walk/etc., that I really don't need to let it do so in multiple ways simultaneously.

Oddly, while I love the tactility of a new tattoo, branding, or scarring, I don't think I could go the implant route. I think having a small bearing under the skin would be too much like a deep boil or pimple and I'd constantly be trying to bring it to the surface.