___________________PROFESSIONAL ADVICE________________________

The best approach is BE DIPLOMATIC!!! (and POETIC!!!)
. . . . . . . . . -------------
TEST THE WATERS BEFOR TAKING A PLUNGE:
... honey, I really enjoy the time we spend together... And, I hope, you know How I feel about you. I would hate to rush into anything, but I wanna get to know the real YOU -- thereby letting you know the real ME. I wanna feel your heart against mine... and I dont want anything in between us -- including our clothes! I want us connect on the most deeply emotional and intimate level. . .

If she says 'Not yet, I'm not ready, (God avoid: Not tonight, I have a headache, LOL), etc.' -- be patient, dont rush her! (that's the usual female trait: first, say NO (as much as she wants to say YES!)
But be persistant: attempt the same/similar approach the next time -- until she gets used to your intentions, and surrenders. . .


All good advice ... But don't call her Honey...Not Sexy!
But be prepared to act on your intentions right away -- the settings are of paramount importance:
the place where the intimacy is to occure Must be prepared in advance! (hopefully with flowers, candles, whatever...) -- your car is a NO-NO! (Its the cheepest place reserved for the quickies!)

In fact, she might be wondering: When will he make the advance?..
--------------- So, do not despare!!! --------------------------
Now, take two aspirines, and call me in the morning -- if you need further assistance... LOL