Prince Charles is not very affectionate, but he oftentimes kisses his mother, Queen Elizabeth II, when they see each other in public. And according to a body language expert, the heir to the throne’s kiss is quite unique.

While speaking with Express, Judi James said that the constant kissing initiated by the heir to the throne is most likely being done to make for his and the Queen’s distant relationship.

When Prince Charles was much younger, he was photographed shaking the hands of his mom after she returned from a lengthy trip abroad. The gesture was criticized by royal experts who said that it proved that Prince Charles and the Queen weren’t close.

“Since then though Charles appears to have gone to great pains to display affection bordering on adoration for the woman he calls ‘Mummy’, performing the hand-kiss to suggest a sense of almost Medieval chivalry and dedication to her service,” James said.

And in return, the Queen also enjoys the affection and display of love that she receives from her eldest son. Whenever Prince Charles would kiss his mom of the cheek, Her Majesty would give her son a beautiful smile with a sense of genuine delight and humor.

“There are gaps of several decades between these poses but the Queen’s reaction looks almost identical. This ‘courtly love’ display which puts the woman on a pedestal, making her the object of a ‘knight’s devotion’ suggests Charles has an idealized and romantic view of life. He even adds to the drama by pulling a facial expression that looks almost pained to suggest extra intensity as he kisses his mother’s hand,” she said.

Meanwhile, royal experts previously revealed that the Queen and Prince Philip left their two eldest children, Prince Charles and Princess Anne, under the care of their nannies. But as they got older, Princess Anne forged a special bond with the Duke of Edinburgh. Prince Charles, on the other hand, was closest to the Queen Mother.

Prince Charles and Queen Elizabeth II
Queen Elizabeth II and Prince Charles pose with officers during an official visit to the Household Cavalry Mounted Regiment at Hyde Park Barracks on October 24, 2017 in London. Getty Images/Chris Jackson