Nature/nurture: reflections on approaches to the study of homosexuality.

There is understandable apprehension by many people towards claims that biology plays a significant role in the etiology of homosexuality. These worries should not be allowed to deter any such work on sexual orientation. It is argued that the only proper way to evaluate biological analyses is against the full background of Darwinian evolutionary theory. Moral issues pertaining to biological research on homosexuality are addressed. Finally, it is urged that both biological and environmental factors be considered in rendering a true picture of homosexuality.