Over the past several years, various operational definitions of gender have
been used in studies of gender conformity in homosexual males. The goal of
these studies is to demonstrate that childhood gender nonconformity (CGN)
is either the proximate cause of adult homosexuality or an intermediate ste
p in a biologically mediated process. The hypothesis of a causal connection
between the development of gender and sexual orientation is embedded withi
n the context of a biological (evolutionary) understanding of human behavio
r. Thus, testing the hypothesis of a causal connection between CGN and sexu
ality requires a concept of gender that is compatible with the basic princi
ples of biological causation and our current understanding of evolutionary
processes. I will argue that the concepts of gender used in the attempt to
demonstrate a causal connection between CGN and sexual orientation are inap
propriate because they provide no uniform, consistent method for identifyin
g and measuring the biologically significant components of gender. I will a
lso argue that the concept of gender that does emerge from these studies su
ggests an hypothesis about the connection between sexuality and gender that
is not consistent with the cross-gendered theory of the etiology of homose
xuality.