Studies claim to show that the poster is wrong.

Holland Davis:

Eight major studies of identical twins in Australia, the U.S., and Scandinavia during the last two decades all arrive at the same conclusion: gays were not born that way.

“At best genetics is a minor factor,” says Dr. Neil Whitehead, PhD. Whitehead worked for the New Zealand government as a scientific researcher for 24 years, then spent four years working for the United Nations and International Atomic Energy Agency. Most recently, he serves as a consultant to Japanese universities about the effects of radiation exposure. His PhD is in biochemistry and statistics.

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Slate:

Baby, you were born this way.” As soon as Lady Gaga sang these words on her smash hit “Born This Way,” they became a rallying cry for gay people around the world, an anthem for sexual minorities facing discrimination. The shiny, catchy song carries an empowering (if simple) message: Don’t be ashamed about being gay, or bi, or trans, or anything—that’s just how you were born. Gaga later named her anti-bullying charity after the same truism, and two filmmakers borrowed it for their documentary exposing homophobia in Africa. A popular “Born This Way” blog encourages users to submit reflections on “their innate LGBTQ selves.” Need a quick, pithy riposte against anti-gay bigotry? Baby, we were born this way.

But were we? That’s the foundational question behind the gay rights movement—and its opponents. If gay people were truly born that way, the old canard of homosexuality as a “lifestyle choice” (or “sexual preference”) is immediately disproven. But if gay people weren’t born that way, if scientists were unable to find any biological basis for sexual orientation, then the Family Research Council crowd could claim vindication in its fight to label homosexuality unnatural, harmful, and against nature.

In recent years, scientists have proposed various speculative biological bases for homosexuality but never settled on an answer. As researchers draw closer to uncovering an explanation, however, a new question has arisen: What if in some cases sexuality is caused by an identifiable chemical process in the womb? What if, in other words, homosexuality can potentially be prevented? That is one implication of one of the most widely accepted hypotheses thus far proposed. And if it’s true, it could turn out to be a blow for the gay rights movement.

Some of the strongest current evidence that some people are born gay is based on a phenomenon called the fraternal birth order effect. Several peer-reviewed studies have shown that men with older biological brothers are likelier to be gay than men with older sisters or no older siblings. The likelihood of being gay increases by about 33 percent with each additional older brother.