what ever feels comfortable with you and what ever you get the most pleasure from

Doing what comes instinctually can have a powerful effect both on yourself and on your partner. If you want to move your hips, just try to feel what your instincts tell you and let yourself go into what feels good.

As a simple example, I recall the first time I kissed a girl: I was so nervous and didn't really know what to do ... we started "softly" but all of a sudden I just got this urge to pull her close and hold her. And without really thinking, I did it and we both became really hot and passionate, and almost started making out right there in the park! We discussed it later and she told me that I gave her exactly what she needed at that moment and made it really enjoyable for her (and me!)

So the moral of the story is that your instincts are often more insightful than your brain when it comes to how to sexually interact with people. Learning to listen to them can be a very helpful skill.

Yup! what they say....

Respond however the spirit moves you.

You will find that as you elevate your hips or match his stroking and thrusting, that deep-seated nerves at the root of the genitals buried within the abdominal cavity will be activated and will add much to your pleasure. That you are enthusiastically responding by mirroring his movements does much for his emotional pleasure, also.

Instinctively, I know for me would be to move my hips with him. If thats what first comes to your head, do it. If you've been doing it without moving your hips and you find it uncomfortable, then try moving your hips. If you dont like it, dont do the next time. I would think you would get more pleasure from doing it though.