(Emotional and/or physical)
We all want to enjoy an interesting and varied sexual landscape, and if you do the same thing every week it can become boring, even if it's in the exciting realm of BDSM activities. Those who are sadistic or masochistic may want to consider taking a break from such activities on a regular basis to prevent them becoming monotonous.
When you take a break from things you enjoy, you appreciate them more when you do engage in them. My masochist and I often taken an entire month break from sadism - to prevent it from feeling routine.
Another reason for taking a break, is to prevent the masochists pain tolerance increasing too fast and too far over the years.
Some feel it is a good thing to increase pain tolerance and become increasingly extreme, however at some point you will have pushed your dopamine receptors so hard, you have no where left to go.
Very little things will hurt, very little things will be exciting, forcing you to push the boundaries further and further with each year.
At that point no pain is pleasurable, in fact few things are pleasurable at that point because your dopamine needs are excessive and you have damaged your receptors, and that's when you're in real trouble. At this point you may begin to struggle with impulse control and depression.
Many of you recognise yourself, in this advice.
The Long Term Risks of Sado-Masochism
It happens so rarely for me that I'll never have that problem.