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Cervical mucus presents a greater barrier to abnormal sperm that cannot swim properly or that present a poor hydrodynamic profile than it does to morphologically normal, vigorously motile sperm and is thus thought as one means of sperm selection Hanson and Overstreet, ; Barros et al. Evidence from vaginal sonography of uterine peristalsis and hysterosalpingoscintigraphy. In the past, the presence of progesterone used to be the basis for all clinical methods of evaluating ovulation. Altogether, the evidence indicates that leukocytic invasion serves to protect against microbes that accompany sperm and does not normally present a barrier to normal motile sperm, at least not shortly after coitus.