Hi doctor, last day I gifted a menstrual cup (size - small) to my girl friend. Then she tried to use it. But later she said, she can not insert it. She also watch many instruction videos bt it can not. She is telling that her vaginal opening is smaller because a short portion of her middle finger can be insert to it. While she hardly inserting the menstrual cup, it become painful. Still She never had sex. Is that the issue? Can you suggest me the Solution?