I've seen several references in some other posts about penetrating a woman's cervix with the cockhead. *Apparently it feels like it's popped inside an orifice. *One post said they went to the doctor to have it deliberately opened for deep penetration. *
I always thought it was a tight little thing (not photogenic, either) just open enough for menstration. *A hazard of using an IUD is that bacteria may climb up the string to enter the uterus. *During pregnancy the cervix closes up with a mucous plug. *The opening of the plug is when her water breaks. *Labor contractions are the slow, painful opening of the cervix to the diameter of the baby's head.
That the cervix can open to cockhead size during sex (1 1/2"+) is a new one to me. *I'd been cautioned not to bang the cervix, which would inflict damage, and not to slam into a virgin's hymen in case she had the medical condition known as prolapsed uterus (partially-"detached" uterus in the vagina).
Some people posted elsewhere, critical comments of a site http://www.penissizedebate.com/page18_penis-length.htm
for it's content. *I see some of the essays show signs of bad evidence or conclusions. *Anyway, the above link has some diagrams that may explain feelings of the dickhead in deep, next to the cervix. *Instead of hitting the cervix head-on (no pun intended), they suggest that a large penis may result in the uterus being pushed either up or down depending on the angle. *The cervix in these views is not at the back of the vagina, but sideways, like a side door at the end of a hallway. *Perhaps this is an alternative to the notion that you are really opening the cervix.
I plan to look for other web sites, especially medical, that discuss an open cervix resulting in penile penetration of the uterus. *If you put your comments and experiences here in one thread (even if they just duplicate from elsewhere), then it may benefit further discussion.
Here's one thread to which I was referring: