It may be remarked that Bergh believes that the nymphæ, and indeed the external genitals generally, are congenitally more strongly developed in libidinous persons, and at the same time in brunettes, while in public prostitutes this is not usually the case, which confirms the belief that exalted sexual sensibility does not usually lead to prostitution. He adds that prostitution, unless carried on for many years, has little effect on the shape of the external genitals.
Schurig (Muliebria, 1729, Section II, cap. II) gives numerous quotations on this point; thus De Graaf wrote in his book on the sexual organs of women: "Tales protuberantiæ nymphæ appellantur ea propter quod aquis e vesica prosilientibus proxime adstare reperiantur, quandoquidem inter illas, tanquam duos parietes, urina magno impetu cum sibilo sæpe et absque labiorum irrigatione erumpit, vel quod sint castitatis præsides, aut sponsam primo intromittant."
Havelock Ellis, "The Bladder as a Dynamometer," American Journal of Dermatology, May, 1902. If a woman who has never been pregnant, standing in the erect position before commencing the act of urination presses apart the labia minora with index and middle fingers the stream will be projected forward so as to fall usually at a considerable distance in front of a vertical line from the meatus; if when the act is half completed the fingers are removed, the labia close together and the stream, though maintained at a constant pressure, at once changes its character and direction.