ok, I was straight and now i'm bi... I wish I was in the girl's shoes... I would date you anytime... =D
well, I'm not sure if the girl is as analytical as me, but I would consider many aspects, from a
conservative straight girl's point of view. Um, the things that I bring up are not going to sound nice but this is not meant to be offensive.
The extent of acceptance on her side, how her family and friends would affect her and see her on her side, and how your family and friends would see her on your side, and if things do not work out due to sex, how she'd have to handle it, whether there's any future in it, how she can have a family, how you are going to support and provide for her, how she must deal with all the lame people who gossip and talk behind her back, and the long list goes on... so naturally, she'd be afraid... but of course, letting her know that you are as afraid and insecure as her, might help a little...
If she is open minded and courageous enough and place love on a high priority, she might go on dates with you... but otherwise, well, you might have to work very hard for her... so you'll have to ask yourself if she's worth it... hope the above helps... good luck!!