<P> Estradiol is also responsible for the increased production of pheomelanin, resulting in the characteristic red color of the lips, labia minora and sometimes labia majora . Estradiol together with other ovarian steroids also cause the darker coloration of the areola . </P> <P> Testosterone will cause an enlargement of the clitoris and possibly has important effects on the growth and maturation of the vestibular bulbs, corpus cavernosum of the clitoris and urethral sponge . </P> <P> Changes of the vulva initiated by estradiol as well as its direct effects also appear to influence the functioning of the lower urinary tract . </P> <Table> <Tr> <Td> </Td> <Td> This section needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table>

The onset of puberty is an example of