University of Queensland researchers found that environmental factors can sway a woman's preference of a mate.
The world's milder males can make hay while the sun shines as the best of women find them attractive in times of economic downturn.
The study found that when there is a threat of disease, women prefer masculine males. But when there is an economic downturn or recession, they count upon the milder and softer ones who are committed to marriage and relationships and who care about kids.
"Masculine males have increased testosterone and robust immune systems. This indicates if you mate with a masculine male they can pass on their increased immunity to a child. Women want to pick the best package to suit their situation," researchers said.