How does sperm motility affect fertility? Poor sperm motility can be a cause of male factor infertility. Around 90 percent of male infertility issues are caused by low sperm count, but poor sperm motility is an important factor also.
The exact cause for low sperm motility can vary. Some men may have a genetic cause, while others may have an undiagnosed medical.
Having a low sperm count can make conceiving a child difficult, but of abnormal sperm shape (morphology), movement (motility) or function.