Which do you prefer - a pretty boy or more of a masculine face? It turns out that women's taste in men could be affected by whether they live in a healthy country or not.

Psychologists say that women are more inclined towards feminine faces in healthy countries, while in countries where disease is rife women are more attracted to masculine features (where a strong genetic make-up is critical for survival).

Lead researcher Lisa DeBruine from Aberdeen University explains: "When women are choosing a mate, they're weighing up two different things.

"On the one hand a really attractive, high genetic quality mate will give them very healthy offspring. On the other, there is getting "investment" from a mate – one who'll be a good dad."

"Men who are really attractive tend to be able to pursue whatever mating strategy is best for them," she added. "They are more likely to prefer short-term relationships. More feminine men tend to be better providers."

The study looked at the preferences of 4,794 women across 30 different countries using computer generated images of masculine (heavier jawed men) versus softer male faces.

Women in Mexico, one of the least healthy countries in the study, preferred more manly faces 54% of the time, compared with only 32% of the time for women in the healthiest countries, such as Sweden.

"Certain environmental factors shift the balance when a woman is choosing a mate, and health is one of those. If a woman lives in an environment where there are lots of pathogens and disease, they are more likely to trade off a good investment in favour of better health for their children," DeBruine said. "In places where health is less of an issue, women are not so willing to do that."

In case you're wondering, women in the UK preferred masculine faces 43% of the time. According to the theory, this reveals we're a reasonably healthy nation with a taste for pretty, feminine boys.

How do you like your men? Leave a comment and let us know what you think...

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