It is very important to know that there are two types of orgasms. 1) Clitoral orgasm is the orgasm that occurs to oral or manual stimulation on the clitoris. 2) Vaginal orgasm will occur during intercourse or penetration. Some women I know can only achieve clitoral orgasms and not a vaginal orgasm. In that case, it is nearly impossible for a woman to achieve an orgasm during intercourse. That may be the issue here.