Gender and Sexual Differentiation

Select one of these short articles on the guevodoces, eunuchs or castrati, respectively:

http://www.medicaldaily.com/guevedoces-dominican-republic-dont-grow-penises-until-age-12-what-we-learned-studying-353544 

http://www.reuters.com/article/2009/03/16/us-china-eunuch-idUSTRE52E06H20090316

http://www.sciencedirect.com.ezproxy.uta.edu/science/article/pii/S0140673697101982

After consulting one of the articles given above, describe how the scientific study of the development of these particular individuals can further our knowledge of one of the following: gender identity; gender role behaviors; sexual orientation; sexual behaviors (and be sure to define your terms). How does the scientific study of individual variation benefit our understanding of normal gender and sexual development?