There just might be a connection between a suspected decline in male fertility and increased cell phone use, but experts say much more research is needed to confirm an association. In a study led by researchers from The Cleveland Clinic, men who used their cell phones the most had poorer sperm quality than those who used them the least. The lowest average sperm counts seemed to be in men who had the most cell phone use (more than four hours a day); those who didn't use cell phones seemed to have the highest.