This might be of help to a lot of people in this thread:
Can I strongly recommend everyone with this problem read this article. I’ve talked about the Pudendal nerve, and tension over and around the perineal area before. This article is well written and may well help point you in the right direction.
Thanks for linking it lukatov.
(If anyone does not understand terminology or methodology from the article, feel free to post here or PM me and I will explain it.)