With busy schedules, Tinder and Fifty Shades of Grey ruling our lives, it’s easy to forget life’s simplest principles. Luckily, science is here to bring us back to basics.

Many marriages end in divorce or dysfunction, but a lesser-known fact is the secret to making your relationship last longer than your high heels and lipsticks. In his book ‘The Science of Happily Ever After’, psychologist Ty Tashiro gives a surprisingly simple answer: kindness and generosity are the two measures of a long-lasting relationship.

In the book, he details his 40-year journey of discovering what makes relationship work – and again and again, researchers found that the relationships who endure rely on the spirit of kindness and generosity.

Certainly beats a bikini wax.

Read more about the study here.