Why Are There Gay Men? | Male Homosexualy | Live Science

Contents:

• WHY ARE THERE GAY MEN?
• IS A LBIAN, GAY OR BISEXUAL INTY MORE COMMON TODAY?
• WHAT SCIENCE KNOWS ABOUT WHY PEOPLE ARE GAY
• ARE MORY MEN MORE LIKELY TO BE GAY? WHY?

WHY ARE THERE GAY MEN?

Scientists may have fally solved the puzzle of what mak a person gay, and how is passed om parents to their children.A group of scientists suggted Tuday that homosexuals get that tra om their oppose-sex parents: A lbian will almost always get the tra om her father, while a gay man will get the tra om his mother.The heredary lk of homosexualy has long been tablished, but scientists knew was not a strictly geic lk, bee there are many pairs of intil tws who have differg sexuali. Scientists om the Natnal Instute for Mathematil and Blogil Synthis say homosexualy seems to have an epigeic, not a geic lk.Long thought to have some sort of heredary lk, a group of scientists suggted Tuday that homosexualy is lked to epi-marks — extra layers of rmatn that ntrol how certa gen are exprsed.

In homosexuals, the epi-marks aren't erased — they're passed om father-to-dghter or mother-to-son, explas William Rice, an evolutnary blogist at the Universy of California Santa Barbara and lead thor of the study."There is pellg evince that epi-marks ntribute to both the siary and dissiary of fay members, and n therefore feasibly ntribute to the observed faial herance of homosexualy and s low nrdance between [intil] tws," Rice not.Rice and his team created a mathematil mol that explas why homosexualy is passed through epi-marks, not geics.

Evolutnarily speakg, if homosexualy was solely a geic tra, scientists would expect the tra to eventually disappear bee homosexuals wouldn't be expected to reproduce. But bee the epi-marks provi an evolutnary advantage for the parents of homosexuals: They protect fathers of homosexuals om unrexposure to ttosterone and mothers of homosexuals om overexposure to ttosterone while they are gtatn."The epi-marks protect fathers and mothers om excs or unrexposure to ttosterone — when they rry over to oppose-sex offsprg, n e the masculizatn of femal or the femizatn of mal," Rice says, which n lead to a child beg gay. Rice not that the markers are "highly variable" and that only strong epi-marks will rult a homosexual offsprg.Though scientists have long spected some sort of geic lk, Rice says studi attemptg to expla why people are gay have been few and far between."Most mastream blogists have shied away om studyg bee of the social stigma," he says.

IS A LBIAN, GAY OR BISEXUAL INTY MORE COMMON TODAY?

Well there are many exampl of homosexualy nature, 's very mon." Homosexual behavr has been observed black swans, pengus, sheep, and other animals, he says.Rice's mol still needs to be tted on real-life parent-offsprg pairs, but he says this epigeic lk mak more sense than any other explanatn, and that his team has mapped out a way for other scientists to tt their work."We've found a story that looks really good," he says. The term “homosexualy, ” while sometim nsired anachronistic the current era, is the most applible and easily translatable term to e when askg this qutn across societi and languag and has been ed other cross-natnal studi, cludg the World Valu Survey. Dpe major chang laws and norms surroundg the issue of same-sex marriage and the rights of LGBT people around the world, public opn on the acceptance of homosexualy society remas sharply divid by untry, regn and enomic velopment.

As was 2013, when the qutn was last asked, attus on the acceptance of homosexualy are shaped by the untry which people live. Those Wtern Europe and the Ameris are generally more acceptg of homosexualy than are those Eastern Europe, Rsia, Ukrae, the Middle East and sub-Saharan Ai. In many natns, there has been an creasg acceptance of homosexualy, cludg the Uned Stat, where 72% say should be accepted, pared wh jt 49% as recently as 2007.

WHAT SCIENCE KNOWS ABOUT WHY PEOPLE ARE GAY

There also have been fairly large shifts acceptance of homosexualy over the past 17 years two very different plac: Mexi and Japan.

In many of the untri surveyed, there also are differenc on acceptance of homosexualy by age, tn, e and, some stanc, genr – and several s, the differenc are substantial. For example, some untri, those who are affiliated wh a relig group tend to be ls acceptg of homosexualy than those who are unaffiliated (a group sometim referred to as relig “non”). In general, people wealthier and more veloped enomi are more acceptg of homosexualy than are those ls wealthy and veloped enomi.

ARE MORY MEN MORE LIKELY TO BE GAY? WHY?

For example, Swen, the Netherlands and Germany, all of which have a per-pa gross domtic product over $50, 000, acceptance of homosexualy is among the hight measured across the 34 untri surveyed.