If a man’s sperm are low in quantity, or poor in quality, intrauterine insemination may slightly improve the chances—by up to 10%—that the female partner will become pregnant – Source: WebMD – Natural IUI Success Tips

More than 80% couples, where the female partner is under 40, can conceive naturally within a year of having regular unprotected sex. For others, it is recommended to seek medical help. Especially if the female partner is aged 35 or over or if there is any other medial reason to be concerned about, like any treatment for cancer or any sexually transmitted infection.

Can a man who is infertile become fertile?

Many infertile couples have more than one cause of infertility. So it’s likely both need to see a doctor and undergo a number of tests to determine the cause of infertility. In some cases, a cause may never be identified.