Women should use their "feminine charm" rather than trying to appear tough when negotiating with men if they want to secure the best deal, scientists claim.The researchers from UC Berkeley's Haas Business School and colleagues from University College London questioned 100 volunteers about how much they rely on charm when negotiating, and asked their partners how effective they were at negotiating.To gain the most positive results women should avoid making overt sexual advances but appear friendly, authentic and interested in the man they are dealing with, researchers advised.........They found that women who said they flirted more were judged by their...