@Butrflynet,
WEll, she is 17 years old, Butrflynet - I don't think the mother could press charges.
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John,
making love is a two way street - as everything in life, and if you rationally discuss with your girlfriend that both of you should have a satisfying experience during sex, she probably will agree with you. Now you haven't mentioned anything about her having an orgasm, but if she does, it is only natural that she'd reciprocate and extend the same pleasures to you.
If she still refuses to help you reach an orgasm, then you two have a problem and chances are that they're not entirely sexual alone.