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The "genital tubercle" develops into either one or the other between weeks four and nine of gestation, though they won't be visible on a sonogram until week 20 or so. Research indicates that clitoral tissue extends into the vagina's anterior wall. In , they published the first complete 3D sonography of the stimulated clitoris, and republished it in with new research, demonstrating the ways in which erectile tissue of the clitoris engorges and surrounds the vagina. The clitoral glans, or the entire clitoris, is estimated to have about 8, sensory nerve endings. The Online Etymology Dictionary wonders if it came from kleiein , meaning "to sheathe," or klitys meaning "side of the hill," or kleis meaning "key," or kleitoriazein meaning "to tickle. Ethologist Jonathan Balcombe stated that female bonobos rub their clitorises together rapidly for ten to twenty seconds, and this behavior, "which may be repeated in rapid succession, is usually accompanied by grinding, shrieking, and clitoral engorgement"; he added that, on average, they engage in this practice "about once every two hours", and as bonobos sometimes mate face-to-face, "evolutionary biologist Marlene Zuk has suggested that the position of the clitoris in bonobos and some other primates has evolved to maximize stimulation during sexual intercourse".

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