I've gotten good reactions from laying the girl on her back with her ass at the edge of the bed with me standing between her legs. In that position I can change the depth and angle of penetration, if I bend my knees a little I can more easily hit her g-spot. With her legs apart it makes it easy for her to rub her clit. I can also bring her legs together, keeping them straight up or over one of my shoulders, that variation emphasizes the girth of my cock. Or I can put her legs over my shoulders, lean forward, and put my hands on either side of her with my feet farther away from the bed for some deep slam fucking (that is if she can take it).
Granted, the position isn't very intimate, it's definitely not full body stimulation. Usually I'll warm up with her under the covers and a little missionary at first, being slow and gentle with my cock and then when we're ready to really get into it I'll change to this "end of the bed" position. I don't get consistently excellent results from missionary because it's more difficult for her to rub her clit in that position, but it is an intimate way to start. The only other disadvantage to this position is that it's not terribly great for winter because you're both exposed to the cold air, you'll need to turn the heater on and also warm up under the sheets together.
One tip, just because you two are having intercourse doesn't mean you must get her off with your dick alone. Positions that allow her to rub her clit are good, and increases the chance she'll have an orgasm. Don't get hung up with some false notion that she's getting off from masturbation and not sex at that point, it's just not true.
I agree that woman on top is not a good one for guys with long cocks. Most women have orgasms from clitoral stimulation, so you either have to be in a position where she can grind or in a position where she or you can rub it. Grinding positions don't work well with long cocks most of the time. In the position I described above I can very effectively hit her g-spot while being able to keep my thumb on her button. My 8" length makes changing the angle and applying pressure with my hand easy because I generally keep up to 4" outside her at all times-- and switching to deep slam fucking is easy.
