"turn a straight girl" sounds like "how do you brand cattle".
If you want to get her to be intimate with you, show her a good time, treat her nicely, make her laugh, bring her home, cuddle, watch a movie together, offer an inoffensive massage (foot massages are perfect), and move from there slowly.
Most of all, if she's not into it, she probably isn't ever going to be. But nearly every girl I ever dated (I'm male) was exremely curious about the idea, even if she'd never tried it. But if you're female and asking this question, you should know what would turn you on. Try those things, and don't be disappointed if it doesn't work right away. Try again if possible, or move on.