I think that if your lying on your back on the bed, with your bum right near or slightly hanging off the edge of the bed, while he is standing on the floor, this should line you up pretty good for some very good and fulfilling sex. If the bed is too low, have him try getting on his knees, if it's too high, have him try standing on tippy toes to reach...this extra exertion will also help to get the blood flowing, and the more physically involving the process gets, more often than not, the more powerful the orgasms become!
Simon, 20 Something...

My best advice would be to experiment, experiment, experiment, and then experiment some more. Determine this on your own and enjoy the good time finding the answer.
Scott, 30 Something...

Spooning will be your best bet. Get your man nuzzled up beside you while you both lay on your sides, he behind you. This gives a lot of possibilities for vaginal insertion and finger play without having to get any large and lovely bodies in your couple up in an aesthetically compromising position!
Jack, 40 Something...