Ladies, if you want a man on his knees, try wearing high heels! Men are more likely to help a woman wearing high heels than one in flats, a new French study suggests. Researcher Nicolas Gueguen of the Universite de Bretagne-Sud in France observed how helpful men are towards women in high heels versus those wearing flat, sensible shoes. The study is the first ever to investigate how the height of a woman's shoe heel influences how men behave towards her. Research across various cultures has shown at length how important physical features, such as body size and the style and colour of a woman's clothing, influence a man's behaviour towards and judgement of a woman. "Even though a link between high-heeled shoes and sexiness is implied by the many models wearing such shoes in magazines and films, only one previous study has tested the effect of women's shoe heels on men's judgement," researchers said. Gueguen therefore set out to conduct field experiments to test the influence of different shoe styles on men's helping behaviour. He watched what happened when a woman in flat shoes asked people to complete a survey, and whether or not they complied more readily when she was wearing high heels. He also tested whether or not people's spontaneous urge to help changed when the same woman - again wearing shoes with different heel sizes - dropped a glove. The findings show that men's helpfulness increased along with the height of the heels a woman was wearing. However, heel height had no influence on other women's willingness to help. In the final experiment, Gueguen found that men in a bar were quicker to start chatting with a woman wearing heels than when she was wearing flat shoes. "Women's shoe heel size exerts a powerful effect on men's behaviour," said Gueguen. He believes that more research must be done to examine whether this effect depends on a woman's shoe heel size and on any change of gait due to wearing high heels. The study was published in Springer's journal Archives of Sexual Behaviour.