I read the article and it said they had to go through it, so I'm guessing they only had to stick their faces in the others ass. It would seem too brutal to actually stitch their faces to the others' ass but you never know
given that this movie was prob shot on the cheap, i doubt they used cgi or anything. i haven't heard any of the girls come out and condemn the movie or anything
Comments
http://www.dvdtalk.com/reviews/43497/human-centipede-the/
essentially the dude was appalled at what he was seeing on the screen, it does contain some spoilers
<_<
>_>
He lives 3 hours away from me.