My favorite is on my back, butt on a thin pillow (ideal for us is the Liberator JAZ), and him standing at the side of the bed with my legs up, and my feet on his chest or ankles on his shoulders. That way he can penetrate me deep anally with great comfort for me, AND he can look me in the eye, reach over and play with my breasts or massage my clit or even use toys in my vagina. It is wonderful.
The other way I like it is laying on my left side, again, him standing off the side of the bed (he LIKES standing more then laying for these things, because SPOONING works for me too), but anyway, I lay so my behind is right off the edge of the bed and he penetrates me that way. It feels great and he has LOTS of control of movement and depth when standing.
Not sure what angles happen inside this way, but when he cums, I can feel his shaft pulsate with each squirt filling me. That alone has made me orgasm right as he does. It is AMAZING.
Oh...I will add that we have tried with me flat on my tummy and my legs together, and him straddling me and penetrating me that way, but I tend to find our skin pinches this way, and he cannot get very deep. Doggy style, which MANY here simply gush over, just has never worked for me. Hurts every time. Tried every lube known. We don't even bother trying that way anymore. Why bother? We have had YEARS to perfect what works and feels great for us!!!
Good luck finding YOUR happy positions.