[magus113]

Well the thing is, hardcore content like extreme violence or nudity on the DS isn't really as marketable. There are only a handful of mature games on the Nintendo DS that I (and MobyGames) are aware of.

Dementium: The Ward (which was actually pretty creepy and gory all things considered, and I look forward to the second since they've improved a lot of the mechanics that were wrong with the first one)
Grand Theft Auto: Chinatown Wars (which was mostly just because of violence, and language, and the violence was more cartoony)
Resident Evil: Deadly Silence (a port of a bad looking PSX classic that just had random blood sprays everywhere that looked pretty terrible)
Shin Megami Tensei: Strange Journey (I know nothing of this, but I know the SMT series has some pretty fucked up stuff in it)
Touch the Dead (We all know)
Ultimate Mortal Kombat 3 (and of course MK3 is a given).

I think the big selling point of gore and hardcore content is how realistic (or unrealistic) it is to the person playing. I mean you would get a headshot in Gears of War and you saw pieces of things flying and a spray of blood..not exactly the easier thing to pull off on a console like the DS.