How Does Homosexuality And Heterosexuality Evolve? Essay

One theory that many psychologist and scientist are trying to prove is that homosexuality has a fundamental biological basis. Similar to most mammalian species, humans at conception are females (McKnight 22). Toward the end of the first trimester is when the babies with a “male genetic message” begin to have small doses of two hormones, chorionic gonadotropin and luteinizing hormone, which start the altering process of the gonads into testes (McKnight 22). The hormones two jobs are to control the sexual development and control their function (McKnight 22). When the brain starts to develop masculine characteristics and lose the feminine characteristics, the processes are separate and occur at different

A pattern emerges where the scholarly literature exploring this topic is largely focused on males. Reason being is that it appears that males are the sex who are predominantly homosexual in their orientation (LeVay & Baldwin, 2012). However, the sensitivity within the discourse of sexual orientation arises when it is debated upon whether one 's sexual preference is innate at birth, hence a force of nature or biology, or if it is a result of culture, nurture or environmental factors (Emmanuele et al., 2010). Furthermore, an experimental design will be proposed to further examine this topic. Comparing the three chosen studies, it is evident that a biological and endocrinological perspective does account for sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). Of the studies that currently exist on this topic, data shows that prenatal testosterone levels are indicative of sexual orientation (Kraemer et al., 2006; Manning et al., 2007; Miller et al., 2008). This paper addresses a topic that is relevant in today 's society; a topic that has, for the most part, been written off as having any scientific roots (Emmanuele et al., 2010). This paper counters that belief and in reading this essay, it will be evident that biology and endocrinology have a much stronger influence on sexual orientation than previously thought.

He contradicted the argument that homosexual behaviour is related to genetic, hormonal or biological disorder. To abolish these views, the author mentions that ‘no school of medicine, medical journal or professional organization has ever recognized such claims (p. 2) - at least at the time he wrote the article in 1994.

Human sexuality is a common phrase for all, and anything, pertaining to the feelings and behaviors of sex for the human race. Sexuality has been a topic that has been discussed and studied for as far back as 1000 years B.C. and is still being studied today. As the discussion of sexuality has progressed through history, theories have been created based on research and experiments that scholars have implemented, based on their own perceptions of human behavior. Out of the many theories that pose to explain sexual behavior, Sexuality Now explained ten that are seemed to be the most overlapped, and built off of theories. Of these theories, two that were discussed in the text were the behavioral and sociological theory. These two theories cover some of the basic ideas of what could possibly influence a person’s sexuality.

The predictor for sexual orientation has been debated and analyzed for a long time. Two explanations that have established possible predictors are biological factors and envionrmental factors, more commonly known as the "nature vs. nurture" debate. According to various studies, these factors play a unique role in determining ones sexual orientation. For clarification, sexual orientation as illustrated here is defined as "distinct preferences consistently made after adolescence in the presence of clear alternatives" (King, 226).

The research article suggests a structure within the human brain and a genetic link indicate the biological factor for male homosexuality. The journal investigates an experiment about the role of male genetics in sexual orientation by analysing the hypothalamus in autopsy specimens from homosexual and heterosexual men. Increased possibilities of same-sex orientation were discovered in the maternal male cousins and uncles of the participants, instead of their father or parental relatives. Also, the researchers discovered a brain cell group ‘INAH’ had a potentiality of being the sex-orientated DNA, indicating that the reason of homosexuality may be related to genetics.

Homosexuality is at the front lines of the nature versus nurture debate. Many studies have been conducted, but a clear cause has yet to be found. Anti-homosexuals, consisting mainly of religious groups, believe that homosexuality is abnormal, unnatural, and can be changed. Because of their beliefs, homosexuality must be a learned behavior. Whether homosexuality is biological or learned behavior is still a mystery, but scientists are finding more evidence to suggest the former.

The nature and nature of homosexuality is heavily debated. Some people believe that homosexuality is biologically determined and others believe it’s base on ones environment. This topic can be argue to be base on both nature and nurture. Studies conducted in the past decades support both the biological and environmental aspect of homosexuality.

The world has come very far with all the dramatic changes we have faced over the years. Wouldn’t you agree? As much change as the world has been through there are still numerous social problems that still exist in society today. Amongst those numerous social problems, sexual orientation and inequality stand out to me. Research from biology, psychology, and sociology is where our understanding of sexual orientation comes from. There are two hypothetical theories researchers have discovered examining the biological basis toward sexual orientation. One concept is the neurohormonal theory, biologist contend that homosexuality is caused by abnormal sex hormone levels in utero. The alternative theory is based on behavioral genetics, determining the source and magnitude of genetic impact on sexual orientation. This theory suggested the concept that gay men were genetically female. Later this theory was proven to be false. Homosexuality was considered as a pathology or mental illness. Not every psychologists agreed with that perspective. A researcher by the name of Havelock Ellis stated that homosexuality was congenital and for that reason it could not be considered as a disease. Sigmund Freud another theorist had the concept that everyone is born bisexual and that either homosexuality or heterosexuality is developed through social and personal experience. Ellis and Freud both concurred that homosexuality was not a mental illness. Despite these researchers’ opinions in 1973,

It has long been debated where our sexual orientation comes from, particularly whether its biological or social forces driving these behaviors. In regards to homosexuality and bisexuals, some have argued that it may be a choice that these individuals are making.(Levay 2012: 41)Some have even said it is a mental disorder that one can recover from, but there is plenty of data that says otherwise.(Levay 2012: 41)(Levay 2012: 65) I believe diverse sexual orientations develop in humans due to sex hormones during fetal life, gene influences, and other effects such as birth order influences. I’ve come to this conclusion based on the narrative provided via Dr. Simon LeVay’s book Gay Straight, and the Reason Why, and the research that has been compiled showing strong influences from a multitude or reasons. I will also be looking at a research paper by Francesca Iemmola and Andrea Camperio Ciani, who looked into genetic factors influencing sexual orientation in men. It is clear there are gender differences between men and women, and this is probably one of the strongest indicators that hormones can affect the outcome of variations in gender traits.

I have known Rachel since we were in third grade and she’s been a close friend for most of that time. When we were in high school she told me that she was a lesbian and that she had known since we were children. She has tried dating men but doesn’t feel the kind of attraction for them that she had and still has for women. In a conversation we had nearly two years ago she told me, “I’m almost jealous of you. Sometimes I wish I could be attracted to men, it would make my life so much easier.” That comment has stuck with me ever since. She does not have it easy as a lesbian in a society that looks down on her for being an openly gay woman. People make snide comments at her and for the longest time her mother absolutely refused to believe she

Throughout history there has been speculation about what influences sexuality in men and woman. Is sexual orientation biological or cultural in nature? There is a common misconception that sexual identity operate in parallel with gender roles( Sell, 2005 as cited in Wilkinson & Roys, 2005, p.65). Scholars have not came to an agreement regarding what actually comprise a person’s sexual orientation, however a sexual orientation has been deemed a cumulative experience and interaction of emotional and sexual feelings towards one or both genders (Wilkinson & Roys, 2005, p.65). The paper provides provides some clues as to what factors influence sexual orientation in men and woman.

In today’s day in age, different sexualities and gender identities are quickly becoming more accepted in mainstream society. Despite this change, there are many people who believe that having a different sexual orientation or gender identity is a choice that is frowned upon. In order to refute this belief, research and biology of the brain is necessary. Researching the brain on the basis of sexuality is a fairly new topic of discussion because it is somewhat difficult and confusing. This paper will explore the different identities of gender, sex and sexual orientation and the main biological reasons behind these. There is also some validity of different sexual orientations and identities through the evidence of sexual disorders like

According to the research done in 1991 by neuroscientist Simon LeVay, the area of the brain that controls sexual activity called the hypothalamus, was less than half the size in homosexual males compared to heterosexual males. This result tells us that homosexuals might not have gotten a chance to choose their sexuality because they were simply born into it. But there are loopholes in this research because Levay's subjects were all cadavers, therefore he could

The question of what causes some people to be sexually attracted to members of their own gender generates many different answers. In recent years, startling new research (Barinaga, 1993, p.17) has indicated that homosexuality is possibly inherited and determined by biological differences in Brain structure and genes. This study raises an interesting question: If homosexuality is hereditary, is there any basis for societal discrimination against something innate? If it is nature, it is good. If it is good, it should be accepted. A genetic component in sexual orientation would send a message to homosexuals and the society that homosexuality is not a fault, and not the fault of anyone other than nature. Gays and lesbians are born in nature, just like some people who are inherited left-handed gene from their parents.