“Relative sperm motility (motility of treated spermatozoa normalized to control sperm motility) was increased (p < 0.…) when co-incubations included ET and yohimbine (alpha 2-adrenergic receptor inhibitor); conversely, co-incubation of yohimbine (100 …) and DHET decreased (p < 0.05) the percentage of motile spermatozoa when compared with controls.”