"5-Alpha Reductase is the enzyme that facilitates the conversion of testosterone to another hormone, dihydrotestosterone (DHT). When a genetic male is deficient in 5-Alpha Reductase, the powerful DHT hormone is not produced. While testes and Wolffian ducts do exist internally, the male external genitals are similar in size and appearance to those of a normal female. If left intact, an adult 5-Alpha Reductase Deficiency individual will appear generally male but with small genitals and no facial hair. Sometimes the parents of children with 5-ARD are encouraged to raise their children as girls."