PGAD | Persistent Genital Arousal Disorder

I read about PGAD or Persistent Genital Arousal Disorder today and I was quite surprised that there is a disorder like this. Here are some articles about this disorder:

From About.com:
Persistent genital arousal disorder (PGAD) is a newly described disorder that is not yet fully understood or defined. It refers to the experience of persistent feelings of genital arousal

(often described as “pelvic tension”) that are not associated with sexual stimulation of any kind, that don’t go away on their own, and that cause the individual pain or distress.

- Source : http://www.pinay-chicken-heart.com