Experimental Factor Ontology identifier EFO_0700067 (non-syndromic male infertility due to sperm motility disorder) is a rare, genetic, non-syndromic male infertility disorder characterized by infertility due to sperm with defects in their cilia/flagella structure, leading to absent motility or reduced forward motility in fresh ejaculate. Reduced semen volume, oligospermia and an increased number of abnormally structured spermatozoa is often present. Also known as: isolated male infertility due to sperm motility disorder, non-syndromic male infertility due asthenozoospermia, nonsyndromic male infertility due to sperm motility disorder.