Concerned about the state of marriage – and thus the ability of whites to procreate – eugenicists were behind some of the earliest modern marriage manuals.
Scientists don’t ask how some people evolved to be tall. In the same way, asking how homosexuality evolved is the wrong question. We need to ask how human sexuality evolved in all its forms.
Bill Sullivan, Indiana University School of Medicine
A new study of nearly 500,000 individuals finds that many genes affect same-sex behavior, including newly identified candidates that may regulate smell and sex hormones.