ahhhh, let me share this with you.... this is a tangent....
"photorealistic" violence / sex is really creepy to me. especially the simulated sex (GTA: SA) -- it's not titilating, it just is surreal and creepy.
BUT,
more stylized bloodshed and sex (i.e. handdrawn) -- well, it doesn't creep me out, even if it is more hardcore than the photorealistic stuff.
many movies, for example, have a very stylized aesthetic that makes the violence / sex seem more like a gruesome painting instead of a gritty, real-life documentary (i.e. Mario Bava's films, Dario Argento's films).
back on topic...so, GTA:SA creeps me out -- not simply because it is photorealistic... but because you are the "actor" performing the violence / simulated sex. The difference between passively watching a film (voyuerism) and actively committing simulated acts (gaming) is somewhat important for me when it comes to the "creepiness" factor.
and yes, I know that many folks would consider the stylized sex / violence to be just as creepy as their photorealistic counterparts.
All I can say is that I'm not a big fan of "photorealism" in general: it always seems like a poor imitation of life... there is always something "awry" and "off" that turns me off. I'm talking about CGI in movies (special effects) as well as games.
sorry for the tangent....