In spanking, clenching means to press the bottom cheeks tightly together by tightening the gluteal muscles. The pelvis is pushed forward, and the cheeks become hard and will lead to the formation of two depressions on their sides, between the hips and bottom cheeks.
Means against clenching
Clenching is a common reaction by spankees when they are being spanked. While a minimal amount of clenching can serve as nice visual feedback for the spanker, continuous clenching is usually undesirable because of two reasons: it is perceived as an act of resistance by the spankee (hinting that the spankee is not truly submissive and apologetic, if the spanking is meant to be disciplinary); a clenched bottom is less spankable than a relaxed one.
As such, spankers will often either explicitly tell spankees not to clench, or choose a spanking position that makes it difficult for the spankee to clench. These are all positions in which the spankee's legs are at an angle to the torso. In other words, almost every position except the standing position and the lying position. Positions with spread legs not necessarily prevent clenching.
Other methods to prevent clenching:
- Verbal instruction
- Securing the spankee's legs in the over-the-knee position such that the legs can't move all the way up, to keep them angled
- Placing a pile of cushions, pillows, or a bolster under the spankee's hips in a lying position
- Making the spankee have their heels pointing outward and toes pointing inward
Disadvantages of clenching for the spankee
For a spankee, clenching the bottom cheeks during a spanking does not necessarily make the spanks hurt less, contrary to what a spankee might think when they're being spanked. Some people say that clenching makes a spanking actually hurt more, because flexed muscles are less able to absorb the impact of the blow as compared to relaxed muscles — such that more impact energy has to be absorbed by the outer body layers.