Claassens OE, Stander FSH, and Kruger TF, 1989: Does the wash-up and swim-up method of semen preparation play a role in sex selection? Arch Androl 23: 23-26.Claassens OE,Stander FS,Kruger TF,et al.Does the wash-up and swim-upmethod of semen preparation play a role in sex selection...