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 "Above the vagina is the Mons pubis" 

 This should be changed to: "Above the vagina is the urethra, and beyond that (outside the the labia minora but within the labia majora) is the clitoris. All of this comprises the vulva. From the front side of a person, the vulva is typically hidden by the pubic hair on the mons pubis." 

 "the hymen covers the opening of the vagina from birth until it is ruptured during sexual or non-sexual activity." 

 This can lead to some dangerous misconceptions. I suggest the change: "the hymen typically covers all or most of the opening of the vagina"