Grindhouse release is not the strong version!
Well that's what I thought at first...when I loaded the disc, I went to the chapter options first and the chapter for the prostitute murder went straight to the tame version. The strong footage looked like it was only available to watch in the extras menu. So I panicked!
But I was wrong - you get to see the strong version when you press the PLAY button, and then the option comes up of which version to watch.
Feel a bit silly now!