Objects always fuse to your finger when you touch them. You often don't notice this for two reasons: 1) Your finger is stronger than the object you are touching. When you pull away, you rip atoms off the object and these atoms remain fused to your finger as a microscopic residue. 2) Your finger is stronger than the bonds fusing you to the object. When you pull away, you simply break the bonds holding you to the object. If you notice this at all, you experience it as a sticky feeling when you pull your finger off of a substance.