Many cases of unexplained infertility and sub-fertility are thought to be attributable to male factors.
Male infertility is defined as the presence of abnormal semen parameters in the male partner of a couple who have been unable to conceive after one year of unprotected intercourse.
For couples who are unable to conceive a male infertility associated factor is found in 50% of cases.  Studies show that acupuncture has substantial effects on reproductive function and helps male fertility by improving sperm count concentration,  sperm quality  and sperm motility. 
Causes of male infertility can range from physical problems to psychological problems and hormonal imbalance.
How to improve male fertility and some of the factors which can affect male fertility:
- Smoking and other recreational drug use
- Alcohol abuse
- The use of anabolic steroids
- Toxins and heavy metals
- Extreme exercise regimes
- Poor diet, malnourishment and vitamin deficiency
Fertility often reflects a man’s general overall health and well-being. A healthier lifestyle is more likely to produce healthy sperm.