An explicit sex video featuring footy star Hamiso Tabuai-Fidow is central to the breakdown of his romance with NRLW poster girl Jaime Chapman, Daily Mail Australia can reveal.

The footy power couple's almost year-long relationship ended recently, with our exclusive reporting pointing out the telling signs they had quietly split.

Neither Tabuai-Fidow nor Chapman would comment when contacted by Daily Mail Australia - but now a source close to the couple has revealed that an X-rated video is behind the high-profile bust-up.

The footage features a young woman known to the Dolphins and Queensland State of Origin winger filming herself performing a sex act on him.

Tabuai-Fidow is easily identifiable due to his tattoos, including a recent piece featuring a bear wearing a crown that he had inked on his right thigh.

Our source told us the footage was taken on June 7, when Chapman was in camp preparing for the start of her NRLW season with the Gold Coast Titans.