Non consensual insemination

Hi everyone! One of my best friends just told me that her boyfriend purposely finished inside of her “as a joke”, knowing beforehand that she doesn’t allow it. I was just wondering how others feel about this, have experienced this and even if there’s any legalities behind it if she does become pregnant. I’ve told her that this should be a breaking point with him because it’s no joking matter but maybe if she hears others, she’ll feel more confident in her next choices. Thanks so much in advance!