absolute openness and trust... Honestly. There is no greater male or female orgasm than that attained by being open, honest and giving yourself to your partner fully during sex. My current partner and I enjoy the most mind blowing, toe curling orgasms because we loose ourselves in one another so throughly that sex becomes something of a pure emotional high. You can try positions and different stimulations, but in my experience nothing compares to what you can do when you turn your brain off and use only your emotions during intercourse.
Great tips so far! The other thing I'd suggest (if you haven't already done it) is to explore what you like by yourself. Try all different things, because the more you know about what you like, the better you'll be able to communicate that to your husband.