Did you know that the male and female genitalia were specifically designed for doggie-style sex?
It's true.
When a man has sex with a woman in the doggie-style position, the peehole is lined up exactly with the mouth of the cervix.
So when a man cums inside of the woman's pussy in this position, the sperm is more likely to make it inside of the uterus in this position than in any other position. Hence it makes it easier to make a woman pregnant that way.