The first thing that came to mind was the chest burster scene from Alien. The second thing that came to mind was the giant worm-like monsters from Tremors. You see where I'm going with this? Put those two together and you have what this woman's asshole looks like. Swear to fuck I saw some teeth.
This is a repost, except it's twice as long and much better quality. I got a dozen emails from people wanting to see the whole thing, so here it is. Fap away.