I think that's over thinking it a bit. Same with the person below who didn't think the angle of the stab was right. The show doesn't seemed overly concerned with realism. The scene with Reid acting like it was no big deal being shot above the knee shows that, I mean the guy who shot him was at completely the wrong angle to shoot him where he did and then the doctor going back and forth working on them with blood all over his hands without washing them?

Also someone posted a picture of the blood pool in the other post and mentioned that it wasn't smudged at all so that would probably mean no physical rape either.