It might not even be simple over-reporting; women have more diagnoses than men. Women go to the doctor more.
This isn't to say it isn't still bullshit. I know two women with OCD diagnoses, but neither present typical symptoms. One is the most foul-smelling slob I know, the complete opposite of your typical OCD person. The other seems relatively normal.
Women are typically more communicative than men when it comes to psychological and/or physical ailments -- that's just the nature of things. Have you ever known a woman before?