than reconstruction of the penis, leading many doctors and psychologists, including John Money who oversaw Reimer's case, to recommend sex reassignment based on the idea that these patients would be happiest living as women with functioning genitalia. Available evidence indicates that in such instances, parents were deeply committed to raising these children as girls and in as gender-typical a manner as possible. A 2005 review of these cases found that about half of natal males reassigned female lived as women in adulthood, including those who knew their medical history, suggesting that gender assignment and related social factors has a major, though not determinative, influence on eventual gender identity. In 2015, the American Academy of Pediatrics released a webinar series on gender, gender identity, gender expression, transgender, etc. In the first lecture Dr. Sherer explains that parents' influence (through punishment and reward of behavior) can influence gender expression but not gender identity. She cites a Smithsonian article that shows a photo of a 3 year old President Franklin D. Roosevelt with long hair, wearing a dress. Children as old as 6 wore gender neutral clothing, consisting of white dresses, until the 1940s. In 1927, Time magazine printed a chart showing sex-appropriate colors, which consisted of pink for boys and blue for girls. Dr. Sherer argued that kids will modify their gender expression to seek reward from their parents and society but this will not affect their gender identity (their internal sense of self). Biological factors and views Some gendered behavior is influenced by prenatal and early life androgen exposure. This includes, for example, gender normative play, self-identification with a gender, and tendency to engage in aggressive behavior. Males of most mammals, including humans, exhibit more rough and tumble play behavior, which is influenced by maternal testosterone levels. These levels may also influence sexuality, with non-heterosexual persons exhibiting sex atypical behavior in childhood. The biology of gender became the subject of an expanding number of studies over the course of the late 20th century. One of the earliest areas of interest was what became known as "gender identity disorder" (GID) and which is now also described as gender dysphoria. Studies in this, and related areas, inform the following summary of the subject by John Money. He stated: Although causation from the biological—genetic and hormonal—to the behavioral has been broadly demonstrated and accepted, Money is careful to also note that understanding of the