Ok, I hope I can explain this to where it makes sense.....
She's at the edge of the bed, and I'm standing on the floor, except that my right foot is planted on the edge of the bed.
This allows for a little deeper penetration, and at a slightly different angle.
Another we like, but can't do for more than about 20 seconds (because my knees suck), is with my feet on the outside of each of her knees, and I squat straight down and enter her. If I were 18 again, I'd be doing this a lot.
Actually, if I were 18 again, I'd be whacking off to the Hustler "Beaver Hunt" column again, but you know what I mean.