Former Scientific Director of the Institute of Molecular Biotechnology of the Austrian Academy of Sciences
Pro to the question "Is Sexual Orientation Determined at Birth?"
"We show that male [gene] splicing is essential for male courtship behavior and sexual orientation. More importantly, male [gene] splicing is also sufficient to generate male behavior in otherwise normal females. These females direct their courtship toward other females (or males engineered to produce female pheromones).
The splicing of a single neuronal gene thus specifies essentially all aspects of a complex innate behavior."