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Researchers quizzed 180 young men and women about their attitude towards relationships and tested them for a gene called DRD4, which affects levels of the brain chemical dopamine.

The tendency to cheat could be down to a variant in a person's genes, a new study has found (picture posed by model)

The one quarter or so with the ‘love rat’ version of the gene were more than twice as likely to be unfaithful. And when they did cheat, they had more one-night stands, the journal PLoS ONE reports.

Researcher Justin Garcia said: ‘What we found was that individuals with a certain variant of the DRD4 gene were more likely to have a history of uncommitted sex, including one-night stands and acts of infidelity.

‘The motivation seems to stem from a system of pleasure and reward, which is where the release of dopamine comes in.

‘In cases of uncommitted sex, the risks are high, the rewards substantial and the motivation variable – all elements that ensure a dopamine “rush”.’

He added that his results suggest it is possible to feel committed to a partner, but still feel the need to cheat on them.

But those with a wandering eye cannot wholly blame their genes.

Mr Garcia, of the State University of New York, said: ‘The study doesn’t let transgressors off the hook. Not everyone with this ­genotype (genetic make-up) will have one-night stands or commit infidelity.’

Last month, scientists found that the same strain of the DRD4 gene can also make people have more liberal views.

Because the genetic variant drives people to seek out ‘novelty’, it can also make people more likely to seek out less conventional political views, the U.S. study found.

Those with the gene supposedly seek out other people’s points of view and are influenced by them far more than those without the gene.

In the U.S. this mean that people with the gene were more likely to have a liberal political viewpoint....