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A country's disease rates influence women's preference for masculine or feminine-looking faces.
Women who live in healthier countries prefer more feminine-looking men, compared with women living in regions where life-threatening diseases are rife.
Masculine men have the greatest appeal for women who live in areas where a strong genetic make-up is critical for survival.
A study of women in 30 countries found they were more likely to choose a masculine-looking partner if their country scored low on a health index based on World Health Organization mortality figures.
By contrast, in countries where people have a longer lifespan, women favored more feminine-looking men, even though they might not have the healthiest genes available.
