Elizabeth Adkins-Regan (1988) also examined sex hormones and their role in sexual orientation by reviewing an animal model for research on sexual orientation. Animal models are not always the best for human sexual orientation research, but they sometimes serve a good purpose. Dr. Regan pointed out the disadvantages of animal models. She say’s it is hard to understand the animal mating systems. There are animals that release scents to attract a specific mate, and also species that can completely switch genitalia to create a balance of male and females when they sense a decline in one or the other. This is common with oysters, and pigs can also reverse their sexual orientation but without switching genitalia. (Regan, …show more content…
(Halley, 1994) It is not genetically caused characteristic because your sexuality is unchanged over time. Someone’s sexual orientation is deep within them and may remain hidden overtime, but it does not change during that period. Genetically caused characteristics would be male pattern baldness. Over time the gene may not be expressed, but it eventually will be as the subject starts to lose hair. (Halley, 1994) Dr. Halley also stated genetically caused characteristics are not immune from environmental influence. They use the word heritable to describe the predictability that a gene would be passed to the young. Scientists were excited and looking at the human Genome project to help them get a better understanding of the causes of homosexuality. Unfortunately, some scientist had hoped to create genetic technologies in order to prevent the existence of homosexuals. (Halley, 1994) They thought of having genetic finger printing, which makes you involuntarily identify yourself as either male or female. They thought of ways to provide parents with reproductive options that would ensure them of not having a homosexual offspring(s). They wanted to target the gene that causes homosexuality and manipulate its influence. (Halley,