Janice;
I think all spots are open except for any specifically forbidden by the woman.
The scenario i like is when the other gent and i are taking turns kissing her at first mixed with a little feeling/caressing. Later, when the clothes are off and we are all on our big king bed, i start out with loving kisses while he licks and sucks one of her boobs. I then begin kissing and fondling the other boob at the same time to heighten the experience for her. She loves having both boobs sucked at one time. Of course hands are exploring elsewhere as well. As I continue to make love to her with kisses he will begin to lick and probe her beautiful pussy with his tongue and fingers. If there is any interest I will explain the rest of the scenario. But I think you pretty much get the picture. Hope this helps...