When people love each other, they may like to play games together. Some grown-ups like to play games that involve being tied up or having something done to them that may seem scary to others, like using hot wax or being hit. These games are called BDSM (which stands for Bondage, Discipline, Sadism, and Masochism).
However, some people think that these games are not safe and they should not be allowed. A long time ago in the United Kingdom, a group of people who liked to play these games were caught by the police. They were then tried in court, and it was called the Operation Spanner case.
The people who were caught and put on trial argued that they did not hurt each other and they were just having harmless fun. But some people did not agree with them and thought that the games they played were dangerous and could cause permanent harm.
In the end, the people who were caught were found guilty and sent to jail. Many people who like to play these games were upset because they did not think it was fair that they could go to jail for loving someone and playing games with them.
Today, there are groups of people who work to make sure that people who like to play BDSM games can do it safely and without breaking the law. They have made guidelines called "Safe, Sane, and Consensual" which help anyone who wants to play safely.