It's all about an ideal display of confidence and self-esteem, with a touch of maturity and graciousness. Of course, throw in a hint of future possibility just to make the experience rewarding, and obey the golden rule of "ladies first". That's the right baits for a great hookup line.
Somehow the combination of all that turns out to be something like this for me:
And if anyone out there got the tools to back this line up, who wants to go fishing? I'll even throw in this comeback line just to be safe:
"Hello there, pretty lady. Would you mind telling me straight up just what's on your mind, before I show you how to have so much fun, you won't be getting any sleep tonight?"
"It's OK, I was just making a complement about how pretty you are. By the way, my name is *insert name here*, what's yours?"
As for myself, I'm quite happy with my lady, if you were wondering.
Strong enough for men, made for women. Anything less will be uncivilized.