Just seconding the "tilt" suggestions. I could not ride either of my bikes if the seats were horizontal to the ground.

My TT bike seats nose is tilted much more towards the ground than my road race bike because the front end is much lower.

I am also experimenting with angling my seats to the left or the right because of swelling to the right of my labia (not the labia itself). I am seeking the right saddle position or the right saddle (see this thread - it describes my similar "symptoms" to yours though not as extreme)
http://forums.teamestrogen.com/showthread.php?t=20637