Lesbian Dating

[kategrace]

So I'm guessing that most of us have had the problem where we meet someone and she flirts with you yet you see her with guys flirting just the same...
Well this girl I'm talking to gave me her number because she'll causually mention "having fun" but she usually says it jokingly. Then she mentioned that I should go to her house... But I think she means to just hang out.
I want to ask her if she's interested in that way but she's a good friend to hang around with to just have good times, but I'm extremely attracted to her, more so than most other girls... but I need a good way to approach her with the big question of whether or not she'll swing my way...cuz she's popular with the guys and she seems to love it...
Grr- Do you guys know some of the best ways to ask her?