From the Perfumed Garden: In addition to being relaxing for the man, this position allows him to delay his ejaculation because the sensations it generates are less intense than when he can thrust freely.
We actually found quite the opposite when we tried this position. If she raises her hips just a touch off of his body and grinds her hips around in circles this position is amazing. Only real problem is how long she can stay in that position.
Hard on the knees but gives you great freedom of movement
Yup certainly not less intense for me!