Movies: Girlhouse (2015), Murder Set Pieces, Books: American Psycho, Survivor by J.F Gonzalez

As far as books go, it's a little dated, but I recommend the works of the Marquis de Sade.

Sure… Go to princes-horror-central.com and you'll find a LOT of vids cut out from movies. It's a real cornucopia of depravity and violence. It depends on what you're into - but the site has everything in categories.

My personal favorites are the scenes where nude women are in a sexual context and get offed. Like:
Appetites - some serial killer invites smokin hot tattooed hookers and fucks then kills them
Showdown from Little Tokyo - a yakuza boss undresses a blonde bimbo played by Renee Griffin and then Some video named Metalface - a black hot babe is tied to a tree in barbed wire, then the killer slashes her tit a bit and then disembowels her
Hazard Jack, Del Playa, Ryde - hot teens getting killed brutally, what's not to like
Women's Prison Massacre - there's once strangling scene that always gets me off
There's also a remake of some old movie with a killer dressed as Santa that punishes the 'wicked' - and he kills some girls filming a porn; one cutie gets her leg chopped off then she is fed into a wood chipper.

Aaaaand a myriad other videos, but these are all I could remember off the top of my head. Maybe search the /dis/ catalog for my other thread about princes-horror-central.

I would also suggest digging in the mediafire archives for Fantom Killer videos - it's a slasher porn with very sexualized killings. Unlike other movies, this stuff is made especially for people that fap to snuff themed stuff - it's pretty great, but most vids have been lost.