For some couples, it is difficult to achieve pregnancy even though they've had frequent intercourse without using contraception for 1 year or longer. About 1/3 of infertility cases are due to male reproductive issues. Male fertility generally depends on the quality and the amount of sperm production. It will be difficult to conceive a child if the number of sperm ejaculated is low, or the quality of the sperm is poor. Hormone imbalance, obstructions preventing the sperm movement, genetic abnormalities, chronic health issues, injuries, lifestyle choices are some of the other factors that cause infertility in males.