The sooner we learn this concerning human sexual behavior, the sooner we shall reach a sound understanding of the realities of sex. A twin study from appears to exclude genes as a major factor,  while a twin study from found that homosexuality was explained by both genes and environmental factors. This differentiation process is driven by androgen hormones, mainly testosterone and dihydrotestosterone DHT. The American Psychiatric Association stated:
The World Health Organization affiliate further noted that gay minors have sometimes been forced to attend these "therapies" involuntarily, being deprived of their liberty and sometimes kept in isolation for several months, and that these findings were reported by several United Nations bodies. These categories directly correspond with the categories of sexual orientation used today: To date, a lot of research has been conducted to determine the influence of genetics, hormonal action, development dynamics, social and cultural influences—which has led many to think that biology and environment factors play a complex role in forming it. Freud believed that in the course of sexual development the masculine side would normally become dominant in men and the feminine side in women, but that as adults everyone still has desires derived from both the masculine and the feminine sides of their natures. Beyond behavior and reactions, one could also assess attraction, identification, lifestyle etc. Have you ever had a romantic attraction to a female? However, if they are considered as separate dimensions one can be simultaneously very masculine and very feminine. Furthermore, reports of same sex behavior usually exceed those of gay, lesbian, or bisexual identification. For example, if homosexual is defined by same sex behavior, gay virgins are omitted, heterosexuals engaging in same sex behavior for other reasons than preferred sexual arousal are miscounted, and those with same sex attraction who only have opposite-sex relations are excluded. According to this theory, all humans are born bisexual in a very broad sense of the term, that of incorporating general aspects of both sexes. There is "little coherent relationship between the amount and mix of homosexual and heterosexual behavior in a person's biography and that person's choice to label himself or herself as bisexual, homosexual, or heterosexual". The living world is a continuum in each and every one of its aspects. Six of these questions assess sexual attraction, four assess sexual behavior, and two assess sexual orientation identity. Even though the research and clinical literature demonstrate that same-sex sexual and romantic attractions, feelings, and behaviors are normal and positive variations of human sexuality, regardless of sexual orientation identity , the task force concluded that the population that undergoes SOCE tends to have strongly conservative religious views that lead them to seek to change their sexual orientation. The authors concluded that "our findings, taken in context with previous work, suggest that genetic variation in each of these regions contributes to development of the important psychological trait of male sexual orientation. In the series of pamphlets, Ulrichs outlined a set of questions to determine if a man was an urning. As a result of this immune effect, alterations in later-born males' prenatal development have been thought to occur. The definitions of each category of Ulrichs' classification scheme are as follows: Despite seven categories being able to provide a more accurate description of sexual orientation than a dichotomous scale, it is still difficult to determine which category individuals should be assigned to. Prenatal hormones and sexual orientation The hormonal theory of sexuality holds that just as exposure to certain hormones plays a role in fetal sex differentiation , hormonal exposure also influences the sexual orientation that emerges later in the adult. Individuals make no physical contact which results in erotic arousal or orgasm and make no psychic responses to individuals of their own sex. Individuals are about equally homosexual and heterosexual in their experiences or psychic reactions. Sexual orientation change efforts and Conversion therapy Sexual orientation change efforts are methods that aim to change a same-sex sexual orientation. Similarly, considering heterosexuality and homosexuality on separate scales would allow one to be both very heterosexual and very homosexual or not very much of either. In a major study comparing sexual response in homosexual males and females, Masters and Johnson discuss the difficulty of assigning the Kinsey ratings to participants.
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