Infertility means a couple is not able to become pregnant after one year of having regular, unprotected sex. Infertility affect both women and men. A woman is considered infertile if she has tried for one year to get pregnant and hasn't used birth control. A man is considered infertile if he has too few sperm or his sperm are too unhealthy to combine with a woman's egg. Many couples do not have trouble becoming. But there are factors that can make it difficult for some.