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It is deposited by a male into a female genital tract, such as the vagina, and later hardens into a plug or glues the tract together. The mating plug plays an important role in sperm competition and may serve as an alternative and more advantageous strategy to active mate guarding. In some species, such a passive mate-guarding strategy may reduce selection on large male size.
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Normal male rats generate vaginal plugs that appear to be firmly apposed to the vagino-cervical junction and permit a large number of spermatozoa to reach the uterus. A few spermatozoa form entangled masses inside these plugs, as revealed by light microscopy. Males in which the seminal vesicles have been partially removed produce plugs that are smaller and softer than those generated by normal males, and the plugs display a cup-like structure at the proximal end.
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Biol Res Rat dorsal prostate is necessary for vaginal adhesion of the seminal plug and sperm motility in the uterine horns. The rat prostate comprises dorsal, ventral and lateral lobes that are morphologically and biochemically distinct.
Just like other parts of your body, the vagina has built-in mechanisms to protect itself, producing lubrication, carrying away dead tissue, and removing unwanted bacteria. They are normally about the size of a small pea and send fluid to the vagina through small tubes. This fluid lubricates the vulva and the vagina.