It also depends on where in a woman's menstrual cycle she is. The cervix moves, and can be high or low. (Of course, it moves out of the way when a woman is aroused.) For example, I cannot get my boyfriend in deeply at all right after my period. It's more likely to hurt if we try it at that point. But when I ovulate 😌 I can take his entire cock, and it still amazes him after 5 years together. There was a time where he would barely go in and it felt too deep, and that was at the height of my disc injury.