约约约必备宝典！

Just Lunch, a dating service for single professionals, surveyed single American adults and found that nearly 70% of men and about 50% of women won't bother with a second date if the chemistry isn't there. When there is chemistry, though, 97 % of men will call to ask out their love interest again -- in 72 hours or less. So, here is how to get it right from the very first date.