Now you want to know: Where do you stick one of these toys? How do you use a suction cup dildo comfortably? And I highly value comfort! Vertical: With a suction cup dildo on a flat vertical surface like a wall , you only have two options for vaginal use: you face the dildo or you turn your ass toward it. As someone who really likes an upward curve for G-spot stimulation, I typically face toward my suction-cupped dildos , and I have their coronal ridges pointing up, toward the ceiling.