While I have never actually had a REAL cock of that length in me (not this liittle girl !!) I have been "plumbed" by toys. Anything inside me past a certain length, for me about 7 inches, touches/ bumps my cervix, and HURTS!!!!!!
(I mean that an eight inch toy most of the way inside, with enough left to hold on to. I guess I have never really measured my "depth". Does this make me shallow?)
A very long (about 2 foot) shared two -headed dildo once resulted in a slightly panicky trip to my GYN, where she told me I had bruised my cervix. I used up 3 boxes of pads for the spotting. It was a lot like the spotting that occurs after a Pap smear, only more so. Since then I have had spotting from deep penatration by a very forceful, "long" partner, but nothing lasting more than a day or so.

"Wider is better"

Nurse Wanda.

__________________
"I wondered, am I a lesbian, am I straight, or bisexual? Then I realized that I am just a slut.
So where's MY parade?"

---Margaret Cho