Background: Asthenozoospermia is a condition associated with low or absent sperm motility in 
fresh ejaculate. Absolute asthenozoospermia, i.e. 100% immotile sperm, is reported in 1of 5000 men. 
Many factors may cause impairment of sperm motility (asthenozoospermia) leading to infertility
Objectives: The aim of the present study is to define the effect of low sperm motility on fertility.
Methods: The study was conducted on 20 males with ages ranging from 20 to 50 years. Semen 
analysis was done in all patients. They were divided into two groups: Group I (control): 5 fertile 
persons with normal motility. Group II: patients with asthenozoospermia. Results: There was a 
statistically significant decrease of mean fertility rate in patients with low total sperm motility.
Conclusion: asthenozoospermia is a major cause of infertility.