Once a cheater, always a cheater. It’s a commonly accepted phrase, but is it actually true?

According to experts, more than 50 per cent of relationships experience infidelity at one time.

If you consider activity on dating apps or websites such as Tinder or Happn as indescretions, that figure creeps alarmingly higher.

Be it blossoming first loves, long-term partners or anything in between; many couples experience rocky ground at some stage in their relationship.

So, why do we do it? According to relationship psychologist and founder of Berkeley International, Mairead Molloy, the motivations for men and women are very different.

Speaking exclusively to Express.co.uk, Mairead said: “It is down to the fact that men love to chase and women love to feel desired.

“Men are stimulated through their eyes and when they see something they like they chase it until it is theirs, especially if it is forbidden.

“Women enjoy feeling wanted and desired, and if they are not getting that feeling from their partner but from somebody else, they are likely to stray.”

There is indeed truth in the statement ‘once a cheater, always a cheater,’ according to Mairead.

And it comes down to a genetic predisposition.

Mairead said: “There are some personalities who can’t resist the chase no matter who they in a relationship with.

“Some people are more predisposed to cheating because it depends on what satisfies their egos, for example some people thrive on feeling desired whilst others enjoy close bonds. People who feel insecure will relish being chased.”

But if monogamy is your aim all hope is not lost, according to Mairead.

She said: “If your relationship keeps one another interested, desired and loved many I believe that can change even the most prolific of cheaters.

“Although the urges to stray may be there from time to time, it is important that couples communicate properly to one another. Remember to organise date nights and trips away, speak about what bothers you and your desires and it will help stop your partner from straying.”