The flux of libido throughout a long-term relationship is not a gendered issue; men have affairs and so do women. Psychologist Esther Perel, author of Mating in Captivity: Sex, lies and domestic bliss has spoken about how marriage has only recently shifted from an economic structure into a romantic one.

She says: “Monogamy had nothing to do with love. Men relied on women’s fidelity in order to know whose children are ours and who gets the cows when I die."

She explains that this shift means we now look to our partner to be so many things: soulmate, wonderful parent, confidant, sexual partner, family, protector, provider, intellectual equal, the list goes on.

With this new pressure on the marital construct, it’s bound to sometimes break. So if you anticipate infidelity might happen, why not create your own rules so the pressure is off one person to provide everything?

And new models for relationships are being created all the time; there is polyamory, the act of having more than one loving relationship at a time; open marriages where both couples have other partners.