Prenatal hormones and sexual orientation Only 23% of childhood gender problems will result in transsexuality in adulthood. Drawing on some transsexualism cases, Garcia-Falgueras and Swaab state that "[f]rom these examples it appears that the direct action of testosterone on the developing brain in boys and the lack of such action on the developing brain in girls are crucial factors in the development of male and female gender identity and sexual orientation ... ." Countless studies have been run on peripheral levels of sex steroids in male and female homosexuals, a considerable number of which claimed to find "less 'male hormone' and/or more 'female hormone' in
Transgender hormone therapy about their care, whether they wish to take the NHS or private route without putting their health and indeed their lives in danger." Self-administration of hormone replacement medications may have untoward health effects and risks. Transgender hormone therapy Transgender hormone therapy, also sometimes called cross-sex hormone therapy, is a form of hormone replacement therapy (HRT) in which sex hormones and other hormonal medications are administered to transgender or gender nonconforming individuals for the purpose of more closely aligning their secondary sexual characteristics with their gender identity. This form of HRT is given as one of two types, based on whether