Something odd about couples has puzzled scientists for more than a century

Scientists have been puzzled for over a century by the common phenomenon of romantic partners exhibiting striking similarities, a pattern known as homogamy or assortative mating.

This similarity can manifest in appearance, personality, habits, attitudes, age, ethnicity, religion, or education. The author's personal observations among friends, family, and colleagues initially sparked curiosity about whether this was a widespread trend or a personal bias. The observation that partners often share professions, or even quirky traits like a love for hiking and loud talking, led to an investigation into the data.

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It's the most common mating pattern globally. You see it in every single culture, in every single country. It's universal.

Behavioral economist Stephen Whyte of Queensland University of Technology (QUT) confirms that homogamy is the most common mating pattern globally, observed across every culture and country. Despite its universality, specific studies on Australian data have been limited until now.

Exclusive customized census datasets from the Australian Bureau of Statistics, covering up to 5.2 million couples in 2021, provided insights into the occupation, religion, and education levels of partners. The data confirms that Australians, like people elsewhere, often seek partners who resemble themselves. However, a deeper analysis also indicates a growing trend towards embracing differences in relationships.

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We have occasionally swapped ID cards to pick up each other's post or other errands.