What does sex have to do with pregncy?

Answer 1

Sexual intercourse can make the woman pregnant if the couple doesn't use contraception, such as condoms or Birth Control pills.

Answer 2

Sexual intercourse is how pregnancy usually occurs. When a sperm fertilizes an egg during intercourse, it may result in a pregnancy. Pregnancy typically occurs when a sperm fertilizes an egg in the woman's fallopian tube, leading to the development of an embryo which implants in the uterus.