Few people have such a front-row seat to the dating and mating game as a bartender. Every night, these drink slingers watch singles meet and greet, go home together, and crash and burn. All of this experience makes them experts on which lines and moves work, and which ones bomb. Here is some of their best advice, thanks to MSN Dating:

This easy opener
"I think the easiest way for a guy to start talking to a girl is to get next to her while she's ordering her own drink and say, 'That one's on me.'" Every girl will at least say thank you and if she's interested, she'll stick around and start a conversation." -- Gia Favia, Rino, Chicago

The three-minute rule
"From what I've seen, a woman's usually made up her mind about a guy in the first three minutes -- and I've never seen anyone's mind change after that. So guys should go in for the pickup, but if three minutes go by and she's not warming up, they should cut their losses and move on." -- David Cerequas, Craftbar, New York

Look out for the Lemon Drop
"You can definitely spot the girls who are looking for a good time and want to flirt: They usually come in groups and line up at the bar versus at a table to make it easier for guys to talk to them. And if you see them drinking Lemon Drops -- a yellowish liquid in a shot glass garnished with a lemon that's been dipped in sugar -- it's a sure sign that these girls just wanna have fun! It's replaced the Cosmo as the drink of choice for the Sex and the City-type girls."
-- Erica Jobe, Moda, New York