It may be painful or uncomfortable if an object such as a penis or sex toy hits the cervix.
The skin may be the same color or darker than the rest of the body.
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It is impossible to imagine a better mechanical arrangement for non-abrasive stimulation of the male and female genitalia than this slick 'sheath within a sheath.
In fact, the depth of the vagina from the opening to the tip of the cervix can measure anywhere up to 7 inches 17.
This seems to help a man to enjoy sex longer without ejaculating prematurely, because he can more easily tell when he is approaching the threshold of orgasm.