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Professor A.K. Slob, Ph.D. of Erasmus University studies the relationship between hormones and sexual behavior in male rats. The science of behavioral endocrinology is used to study the relationship between hormonal action early in the development of male rats and their sexual behavior later in life.
The experiment is visually fascinating as we observe sexual partner preference behavior in male rats. The urge is for the viewer to draw conclusions that have human implications. Here is where the researchers warn us and talk about the limitations of this sort of research. There is a discussion which hypothesizes about the origin of human sexual orientation.