LeBatteur Posted August 10, 2016 At coitus, human sperm are deposited into the anterior vagina, where, to avoid vaginal acid and immune responses, they quickly contact cervical mucus and enter the cervix. Cervical mucus filters out sperm with poor morphology and motility and as such only a minority of ejaculated sperm actually enter the cervix. In the uterus ... ... but that´s not you´re ask for. Or what´s the Meaning of the opening question ? 3