User:Kevin odu

Biology and sexual orientation The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientation, they theorize that a combination of genetic, hormonal, and social factors determine it.[1][2][3] Hypotheses for the impact of the post-natal social environment on sexual orientation, however, are weak, especially for males.[4]

Biological theories for explaining the causes of sexual orientation are favored by scientists[1] and involve a complex interplay of genetic factors, the early uterine environment and brain structure.[5] These factors, which may be related to the development of a heterosexual, homosexual, bisexual, or asexual orientation, include genes, prenatal hormones, and brain structure.

Empirical studies

Biological theories of cause of sexual orientation

Sexual orientation and evolution

Biological differences in gay men and lesbian women