We've all heard the phrases that have become so ingrained in our everyday lives, they almost serve as excuses for male infidelity.
'He's a player.'
'Spreading the seed.'
'His mistress.'
And the phrases that imply women who do likewise are the absolute worst.
'She's a slut.'
'Damaged goods.'
And we've personally never heard the term 'her master'.
Many cultures tie women's sexual modesty with her value. Among the Kipsigis of Kenya, divorced women command a lower ‘bride-price’, and so-called 'honour killings' are regularly in the news globally. Families or husbands of women who have lost their virginity before marriage, or have extra marital affairs, kill them as a solution to the 'shame' she has brought upon the family.
But academics at the University of Texas have discovered that women may well be biologically designed to cheat.
The researchsuggests that women could have an ingrained behaviour that encourages them to look for back up mates in case their current partner dies or leaves.
David M. Buss, who wrote the paper, said: "Nothing in life comes with a guarantee. From an ancestral woman's perspective, hazards from the environment, other species, and importantly, other humans, could render her mate debilitated or dead. A bite from a poisonous snake, an incapacitating disease, or an attack from a warring group could decrease her partner's mate value."
The paper also explained how women are statistically more likely to fall in love with someone they were having an affair with.
What do you think constitutes cheating? A kiss? Flirty text messages? Or just jumping into bed with someone else? Join the debate on Facebook or Twitter at @Closeronline