1. Straight or gay? For male identical twins at least, a saliva test can predict the outcome and is accurate 67% of the time.

But at that time you didn't realize you have am i gay test which help you to find out your sexuality.

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2. The test is the first to assert that it can identify sexual orientation by using hints from minute alterations to a person's genome. 
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4. Many experts have expressed caution about the findings, and the study's principal researcher has completely abandoned the endeavour due to worries over possible test misuse.

According to Michael Bailey of Northwestern University in Evanston, Illinois, "the scientific benefit of understanding 

[why people vary in sexual orientation] is obvious to anyone with an iota of curiosity." Although the predictive test is highly intriguing in theory, it has to be replicated on bigger samples to determine how effective it is.

What  Studies Shows.

Over the last two decades, several studies have suggested that sexual orientation is, in part, down to our genes. Perhaps the biggest splash was made in 1993 by Dean Hamer’s team. 

The National Cancer Institute in Bethesda, Maryland, when they found that gay brothers tended to share a sequence of five genetic markers in a region of the X chromosome. 

The same region has been implicated in other studies of sexual orientation since, although researchers haven’t been able to single out “gay genes”.

Other observations also suggest a genetic basis for sexual orientation, such as the mysterious fraternal birth order effect. For every male pregnancy a woman has, a subsequent son has a 33 per cent higher chance of being homosexual, although no one knows why. 

The overall chance is still low, however, rising from around 2 per cent to just 6 per cent for a third son.

“It seems as though the mother’s body is remembering the sex of previous pregnancies,” says Tuck Ngun at the University of California Los Angeles. A male pregnancy might leave some sort of marker behind that affects subsequent pregnancies. 

This might be down to epigenetic changes – the addition or subtraction of a methyl group to genes, which switches them on or off.

False positives?

Other scientists are cautious about the results. “Studies that associate biomarkers with particular traits are notoriously prone to false positive results due to the tendency of these studies to find spurious associations that are down to sheer chance,” says Johnjoe McFadden, a molecular geneticist at the University of Surrey, UK.

Since the associations have not yet been tested in a completely independent study population, the results should be considered no more than suggestive. There needs to be verification before any firm conclusions can be drawn, he says.

While epigenetic patterns are showing promise as a biomarker for certain traits, it’s still difficult to infer causality. 

Gavin Kelsey, who studies epigenetics at the Babraham Institute in Cambridge, UK, says: “The nub of the problem with studies like these is that when you see methylation changes.

You don’t know whether methylation is the prime event or if it’s reflecting some other event. Methylation might be reflecting a state rather than driving it.”

Ngun himself has concerns that the test has the potential to be used and abused. “I’m gay,” he says, “and I’ve always wondered why I am the way I am. But once you have this information, you can’t control how it’s used or disseminated.”

The study raises concerns that people could try to tinker with epigenetic modifications to change sexuality. Currently, we don’t have a way to selectively change epigenetic patterns on DNA, although the technology is being developed.

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