A scientific study seems to study the effect of a smile from men on the opposite sex, and the results show that women do go weak in the knees, get more relenting and submissive while interacting with men.
A study which observed interactions with male friends and work colleagues, found that women appeared more accommodating when men smiled at them. Perhaps, it was the warmth radiating from the smile which made women feels absolutely coy.
Body language experts have found this observation rather disturbing, especially if women were to depend on body language to take decisions.
"Even if there's dissonance between what's been said and what his body is doing, women will look to the body. If they see a smile, then the interaction seems more friendly. It's a tricky situation, and one that highlights just how subtly sexism can intrude on interactions," researchers said.
"Think through the verbal message before you respond. If he says something sexist and you smile or shrink, it means he can get away with it," researchers caution women.