A study was done in Sweden in which scientists studied the gene types of 552 sets of twins. They found a bonding chemical in some men that makes them less likely to be married and more likely to have bad relationships.

Dr Brenda Wade, a psychology expert who's written three books on marriage and relationships agrees with the study.

"There's a gene that's been shown, that men have this particular gene or a variant of the gene. They have more trouble in relationships," she says.

Scientists say men don't have to cheat, but they do have to work harder at staying faithful.

So cut your man some slack ladies if he slips up once or twice. I mean, it's not like he can help it right?