Ass Up
I used to masturbate on my back or I would grind on my stomach. I've recently discovered that being in a 'doggy position' is nice. I like to get on all fours and open my legs slightly. Then arch my ass up in the air. I insert my favorite toy. (A 9-inch latex cock with little goosebumps on it). In this position I get a good DEEP angle. I can also reach under and twiddle my clit.