The researchers followed 169 newly-weds for four years – and after every six months they checked the couple’s body mass index (BMI).
The results showed that the happier husbands and wives gained weight, while those who were losing weight were trying to make themselves more attractive to other partners, the Daily Express reported.
Dr Andrea Meltzer at the psychology department of the Southern Methodist University in Dallas, Texas supervised the research.
Am I good in bed?
Anxiety related to sexual performance and a lack of concern about the consequences such as pregnancy and sexually-transmitted diseases make both men and women more likely to cheat on their partners
Women who worry about their ability to stay aroused and orgasm are 8 percent more likely to stray for each sexual concern.
Men, on the other hand, are 6 percent more likely to cheat for each worry, such as impotence and premature ejaculation, that they have.
Perhaps unsurprisingly, being unhappy in a relationship was found to increase the chances of a woman straying by between 2.6 and 2.9 per cent.
Gadgets make cheating easier
Couples with the propensity to cheat are finding it easier to do so with the help of Internet, social networking and smartphones, experts have claimed.
Clinical psychologist Karen Nimmo said new technologies made the potential for cheating a growing issue for her clients.
Blame it on daddy!
A study has revealed that cheating really does run in the family, at least as far as men are concerned.
A team of Czech scientists carried out the study that confirmed the old adage ''like father like son’.
They concluded that while men and women both had affairs, men were more likely to stray if their fathers had been unfaithful as they were growing up.
It's a matter of power!
Scientists believe that it is a person''s power, rather than gender, that plays the greatest role in infidelity.
A team of researchers conducted an anonymous Internet survey of 1,561 adults and found that there is a higher risk of unfaithfulness in people of positions of power, no matter the sex.
Too much creativity
Probability of cheating is more in creative people than in the non-creative lot, a new study has suggested.
According to the research conducted by Harvard University, this is possibly because of the talent possessed by the original thinkers, which increases their ability to rationalize their actions.
If you own a luxury car, you are more likely to have an extra-marital affair, according to a new survey.
The survey from UK-based dating website claims to have polled its 640,000 members and found that 19.21 per cent of male members who admitted to being unfaithful were luxury sedan owners.