Arme/Lust (2013). It's a two part short, the Lust part has a very brutal and explicit penectomy on a guy tied up.

The story is basically a girl having a crush on a guy who already has a fiance, so the girl kidnapped the guy, tied him up and raped him. Then used a scissors to snip his dick and she ...

There's an upcoming short movie called "Love you to death." The teaser trailer looks promising. It's self called "Neo-Feminist horror short" and there will most likely be a castration/penectomy (and cannibalization) to it.