Truthfully, there probably is no ultimate sex position for all couples, but the butterfly position is a good candidate.
The “butterfly” may be the ultimate sexual position. The butterfly sex position is easy for both the man and the woman to do, and it’s very pleasurable for both partners. Finally, because it’s a face-to-face position, the butterfly provides intimacy between lovers. This position is called the butterfly because, when the woman’s legs are wide apart and the man is thrusting, her legs simulate the movements of the wings of a butterfly. Read more
Whoever named this position is more imaginative than I, but the name does fit, especially if your feet are at the guy’s waist. Personally, I get better G-spot stimulation with my feet are on his shoulders though.