I agree with dbg00.
Personally, I didn't think I'd be so aroused when a girl started licking and flicking my nipples but it definitely worked. Perhaps she was a real stunner and anything she did worked (psychologically). For a test of reverse psychology, she may be acting upon things that she may like, herself. So try and return the favour and see if she gets aroused. If so, continue to work on it while moving down to DATY. If all is going well, slowly caress and move your hands gently down the side of her body, especially very lightly brushing her waist with the tips of your fingers. I've found this gives shivers down ANY girls' spine. They love that feeling. If you want do it a few times, it gets them excited. The rest is history.
Being the master of foreplay gets your brownie points. It's all good and well to hammer the oblivion out of her (if you're well endowed) but maybe if you're average like me, you need to find your 'Magic'.
Sorry, I digress. Nipples are great