first of all posting here with Firefox 26.0 seems to be impossible (never logs in no matter what), so I had to use another browser.
There might be a connection between PCOS and the "normal" defecation posture (and a lot of other ailments (prostate problems, hemorrhoids, acid reflux, colon problems, etc. etc. etc.)). The normal defecation posture (aka sitting on a toilet) overstretches the pudendal nerve and the pudendal nerve controls the ovaries / prostate. Furthermore the colon cannot fully empty itself.
You can read all about this for free here:
naturesplatform dot com
If you try squatting instead and find it helpful, please email me or post it here or at darmhilfe dot de slash forum