There is no such thing as uterus penetration in real life. As a virgin, I don't really have much experience in this area, but after studying from my anatomy books for tests, I came to the realization that such a thing is impossible, and if it were possible, it would be painful and dangerous for the woman, I think the medical term for that is collision dyspareunia. I'm not sure how this changes my perception of the X-ray tag since I don't condone violence, but it's fictional.
Not impossible, just hard. With an vaginal orifice capable stretching at least 10 times its size to pass a watermelon thru a thing the size of a God damn key lime... nothing is impossible. Painful as fuck but doctors open women cervical canals before. A dick wouldn't be the largest equipment to do so but your dick most likely will break or bend.
Also with a big enough Dick... yes you could. It's only 8-9 in deep to the base of the cervix mouth. Little Dick Problems.