FULFILLED and long-lasting relationships are those where the man is less attractive than his partner and knows it, experts have confirmed.

While alignment on values, social background and shared interests all have their place, nothing secures monogamy than the male being aware that if he f**ks this up he will never do this well again.

Professor Henry Brubaker, of the Institute for Studies, said: “Men thrive on a low, constant hum of fear and gratitude. It keeps them attentive.

“When a man is fully aware he could be replaced within 48 hours with someone taller, more emotionally intelligent and better at DIY, his commitment levels rocket. He is unthinkingly faithful and remembers even minor anniversaries.

“Punching above one’s weight encourages men to participate in activities they would

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