Attitudes towards homosexuality have changed over the centuries. During ancient Greece, homosexual relationships were acceptable, and in some cases expected in certain segments of society. Although, later attitudes towards homosexuality in the Western world were determined largely by Judeo-Christian moral codes, which treated homosexuality as immoral, mental illness or a sin. But, by the 20th century some psychoanalysts viewed homosexuals as having a hormonal imbalance and/or a biological characteristic.

Therefore, tonight I will speak about the biological aspect of homosexuality.

Sexual orientation can determine whom a person is sexually attracted to. Sexual orientation is influenced by biological events that occur at conception or as early in a fetal life before th

Also, the mothers of homosexuals have more sisters than brothers at a rate suggesting that 50% of the males conceived in the mother's generation never cam to term. Turner, a professor from University of New Mexico, said "In addition to there are many more miscarriages than on the father's side, many more suicides, much more infertility, and an abundance of people who remained single past the age of 30." Also, there are more gay relatives on the mother's side of the family.

A particular part of the brain influences various sex hormones. This part of the brain is known as the hypothalamus and is the primary drive center. The hypothalamus was found to be smaller in homosexual men and women, than in heterosexual men. The reason for this is because this part of brains development. Although this part of the brain has some known connection to sexual behavior, "to the fact that homosexual men are much more likely to be left-handed, dyslexic and stutters - all factors related to the development of the br

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