Short answer
They do, on the right surfaces. Suction cups grip best on smooth, non-porous surfaces like glass, smooth tile, mirrors and sealed wood. They struggle on grout lines, textured walls and fabric. For a stronger hold, make sure the surface and the cup are clean, add a little water to the cup, and press firmly from the center outward.
Read the full guideHow to Choose a Dildo: Size, Shape and Material GuideLearn how to choose a dildo that suits your body: realistic sizing tips, curved vs straight shapes, body-safe materials, suction cups and beginner picks. Updated November 9, 2026 · All questions
