All I have to say on this thread is that you have used suboptimal language in your post. With the frequency that the word seems to show up in monster names in D&D, I believe the perineum can only be referred to on a D&D forum as "taint".
Hee hee... taint. (Am I the only one who deals with this in D&D?)
I don't call them "fell taints" I got more sense than that. I usually call them "nightmare things", "creatures from beyond", "unspeakable abominations" or the like.