stockman

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1) Have you 2 had sex with each other yet?  If not, take her to a romantic trip -- candle light dinner, wine, flower, gift.  Afterward sex comes easily.   But your answer also depends on...
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2) Are you working now or just a student?  Do you have a lot of $$?  If $ is an issue you should learn to cook a special dish or bake a birthcake for her.  It doesn't have to taste very good, but you can impress your girlfriend with the time and effort you put in.