is failure to achieve pregnancy after 12 months of unprotected intercourse. Fertility ia a chance event and it is reasonable to wait for 12 months before investigating infertility. The causes of infertility could be in men or women or both. Ideally the investigations for infertility should begin in men and women simultaneously. The current statistics show as much as 40% of infertility could be due to male factors. Male factor infertility could be due to absence of sperms in semen or poor semen quality or ejaculatory problems. The difficulties in assessing men are due to various factors. The semen parameters can change a lot even in fertile men. Assisted reproduction techniques are so advanced most men can be helped to father a child.