actually the reason it got re rated was because of the mod called "Hot Coffee" which is just unlocking a few graphics and gameplay elements in the game which were locked away by a simple check.
this then got thrown out of hand and then became the element of censorship and wrong doing. the thing is these elements which were meant to make the game so bad were originally in the game, and unlocked at certain sections for cut scenes, eg in one mission you bust into a house with ryder in a room in the back you can see a guy getting a blowjob.
what i love though is that this is not allowed because its adult game made by rockstar and wears the GTA logo, then ontop of this we have playboy mansion, which contains alot of nudity, and full sex, yet only got M, and the same goes for Sims2 which with the use of a mod can remove the blurry boxes on the sims when naked. GO ESRB!
anyway back on topic, nice game, would be great to see your models put to use in it.