Clitoris, as i just noticed how unkwnown this is even with educated people

    http://www.etereaestudios.com/docs_html/nbyn_htm/about_index.htm

    Based on urologist's Helen O'Toole research 1998 (!),
    followed later by modern research methods (MRI), O'Connell et al., 2005
 
    http://www.ncbi.nlm.nih.gov/pubmed/16145367