With reference to the story of the egg and the sperm,how does Emily Martin demonstrate how scientists draw on discourses of gender to explain conception?

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The Answer is Sperm are "aggressive" (masculine)and the egg is "passive" (feminine).Martin details such gendered presentations of conception (the terms she cites in quotation marks are those used in science textbooks):
It is remarkable how "femininely" the egg behaves and how "masculinely" the sperm.The egg is seen as large and passive.It does not move or journey,but passively "is transported," "is swept," or even "drifts" along the fallopian tube.In utter contrast,sperm are small,"streamlined," and invariably active.They "deliver" their genes to the egg,"activate the developmental program of the egg," and have a "velocity" that is often remarked upon.Their tails are "strong" and efficiently powered.Together with the forces of ejaculation,they can "propel the semen into the deepest recesses of the vagina." For this they need "energy," "fuel," so that with a "whiplashlike motion and strong lurches" they can "burrow through the egg coat" and "penetrate" it.

With Reference to the Story of the Egg and the Sperm,how