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Abstract Whether biological factors or environmental factors cause sexual orientation is a very controversial subject. Through scientific studies one can come to the conclusion that sexual orientation, more specifically homosexuality, is primarily caused by genetic or biological factors. The discovery of genes that result in homosexuality in male fruit flies, genes that are present in more than two thirds of homosexual men, and neuroanatomical differences between heterosexual and straight men are the basis of this …

…The fact that homosexuality exists and probably has existed in every culture shows that environmental stimulus is a very unlikely explanation. The world today is very different from the world back in the days of the Greek and Roman empires; yet, there is evidence of homosexuality back then. One would be hard pressed to find many similarities between life back then and life today. Therefore, it is very unlikely that homosexuality is a learned trait.