By paying attention to body language, tone of voice and eye contact, potential dates are quick on the draw to determine whether the opposite sex is a keeper or a reject.
The study also found men and women can equally assess interest. That result surprised researchers who expected women to be better appraisers of attraction. They thought women would be more observant, believing females are naturally more cautious when entering a long-term relationship.
Nearly 80 percent of women acted pleasant with men, even though admitting they would reject them if asked for a date.
Speed dating has become the rage among singles. It involves having many dates in one evening in short, face-to-face conversations.