People have been vibing and flirting since the beginning of time, it's really not that hard. Men & women give each other signals, it's up to you to pick up on it. Smiling, making eye contact, saying hello, joking about the long line you're in, are great ice breakers. Ladies, make it easy for the guys. Be receptive, and if you're not interested, at least be kind. Guys, approach with tact and respect. No one should get bent out of shape over this whole thing. It's romance, people, not rocket science.