For a long time, people have been considered homosexuality as a form of “deviant sexual behavior”. (Messerli, 2009) However, evidence has shown that homosexual relationships have already been existed for more than 600 years. (Bryner, 2007) Secondly, many people have misunderstood that sexual orientation is a choice, and that a homosexual can be reformed to be a heterosexual anytime they want. However, thousands of researches have been done over half a century to prove that homosexuality has a biological causation. (Waller, 2003) Scientists have claimed that the sexual orientation of a person is unalterable, and it is congenital. That means if a person is born to be gay, they cannot do anything about it, and it is often hard to change their sexual orientation. Therefore it is not their choice to be homosexual, and it is not fair to treat them differently from others.
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