Zero sperm motility which is also known as absolute azoospermia is generally cause due to several factors. Ultrastructural defects in the sperm where normal semen level and sperm count are available but sperm motility will be zero. Second cause is necrozoospermia where the sperms are completely dead and it can due to several factors like anti-sperm antibodies, infection in genitals etc. However this can be improved if it is treated on time and in fact there are several treatments available which can really benefit you in such condition. Just take care of your sperm and this can help you to maintain your sexual life in better way.