Asthenospermia is a general decrease in sperm motility Asthenospermia Asthenospermia is a general decrease in sperm motility. Motility refers to the percentage of sperm to demonstrate movement of any type. Asthenospermia can have different amounts of sperm. When no sperm cells are produced it is called azoospermia. If few sperm cells are produced then it is called oligospermia.
Caffeine is also a stimulus for sperm and can help for infertility.