Biological basis of sexual orientation

Asexuality Bisexuality Heterosexuality Homosexuality. Aromanticism Biromanticism Heteroromanticism Homoromanticism. Biology and sexual orientation Demographics of sexual orientation Homosexual orientation Lesbianism Male homosexuality Non-human animal sexuality Situational sexual behavior. Biology and sexual orientation is the concept that there is, at least in part, a biological basis for sexual orientation.
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Biology and sexual orientation

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Nature vs. Nurture: The Biology of Sexuality | BU Today | Boston University

Sexual orientation is one of the largest sex differences in humans. The vast majority of the population is heterosexual, that is, they are attracted to members of the opposite sex. However, a small but significant proportion of people are bisexual or homosexual and experience attraction to members of the same sex. The origins of the phenomenon have long been the subject of scientific study. In this chapter, we will review the evidence that sexual orientation has biological underpinnings and consider the involvement of epigenetic mechanisms. We will first discuss studies that show that sexual orientation has a genetic component. These studies show that sexual orientation is more concordant in monozygotic twins than in dizygotic ones and that male sexual orientation is linked to several regions of the genome.
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The biological basis of human sexual orientation: is there a role for epigenetics?

Few aspects of human biology are as complex—or politically fraught—as sexual orientation. Now, a new study claims to dispel the notion that a single gene or handful of genes make a person prone to same-sex behavior. The analysis, which examined the genomes of nearly half a million men and women, found that although genetics are certainly involved in who people choose to have sex with, there are no specific genetic predictors. Yet some researchers question whether the analysis, which looked at genes associated with sexual activity rather than attraction, can draw any real conclusions about sexual orientation. The handful of genetic studies conducted in the past few decades have looked at only a few hundred individuals at most—and almost exclusively men.
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Sexual orientation is an enduring pattern of romantic or sexual attraction or a combination of these to persons of the opposite sex or gender , the same sex or gender, or to both sexes or more than one gender. These attractions are generally subsumed under heterosexuality , homosexuality , and bisexuality , [1] [2] [3] while asexuality the lack of sexual attraction to others is sometimes identified as the fourth category. These categories are aspects of the more nuanced nature of sexual identity and terminology. Androphilia describes sexual attraction to masculinity ; gynephilia describes the sexual attraction to femininity. Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of genetic , hormonal , and environmental influences.
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