The channel with the cervix is lined with cells and glands that secrete mucus. This mucus is thick and impenetrable to sperm till just prior to ovulation. Semen displacement has two principal Advantages for any male. To start with, by displacing a rival male's sperm, the potential risk of https://zoophilia49110.activosblog.com/30692338/dick-can-be-fun-for-anyone