I saw that documentary and got the impression that women who orgasm during intercourse would likely get pregnant more easily because of the action of the cervix. But women who don't orgasm get pregnant and a woman who's raped can also get pregnant. They'd have to do studies on orgasmic and non orgasmic women to find out for sure, and also test the sperm count on the men. And even then it would be difficult to determine as they'd have to figure out ovulation periods and what not.
There was something else interesting about that documentary if I'm thinking of the same one. If I remember it correctly, it said that if a woman had sex and the sperm was inside of her, that if she had sex with another man shortly after, the first man's sperm would kill the second man's sperm. It was somehow explained that her body is used to her husband's sperm and an "intruders" sperm would be considered the enemy.