The thorns are not too obvious and look rather small at first glance but if you focus on the right side of the photo, you'll see how nasty these thorns are. Imagine climbing a tree like this. It must have been a bloody affair.
This type of punishment may no longer be practiced but then again it shouldn't take a thorny tree to deter one's actions in doing something that will eventually lead to destruction of one's self, home and work life.
Proverbs 6:32 - But the man who commits adultery is an utter fool, for he destroys himself. (NLT)