| Value | Category | 
                                    
                    
                        | 1 | 1. Main partner | 
                                    
                    
                        | 2 | 2. Side-partner or Roll-on | 
                                    
                    
                        | 3 | 3. Casual or one-off | 
                                    
                    
                        | 4 | 4. Other | 
                            
            Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.