Using a "zipper" as the kind mentioned here previously an afford differing sensations depending on the body part targeted. CBT, e.g., can be extremely sensitive as a placement ground for the clothespins used, as opposed to, say...the lower torso.

The type of clothespins used matters as well. Plastic, tend to be "sharper" than wooden ones. The manner in which the clothespins are placed matters too. Those that clip on sideways, as oppsed to those that clip on at ninety degree angles to the flesh.

Bottom line is that; use of the "zipper" provides many variations for all.