okay so I've been trying to figure this out, my boyfriend is taller and kinda "large" (over 6 feet and it's about 9-9 1/2") and I'm pretty short (4'11") and during sex he's usually pretty careful but near end when we're both worked up we tend to be a little rougher. The point of this is a bit before we finally finish he usually gives a pretty hard thrust and I feel like an extra stretching inside and sometimes a little discomfort but usually not terribly so and kinda pleasurable if he's only like that for a little bit. If he stays in too long afterwords though like more than a minute or two it actually kinda causes a burning sensation. He said he does feel an extra tightness around his head when he's finishing and I never seem to have any "leaking" afterwords like with other partners. Is he passing through my cervix? if so is that dangerous or not?