Game of Thrones

characters Jaime and Cersei Lannister's incestuous relationship has been frowned upon since day one, but even actor Nikolaj Coster-Waldau admits the love affair feels a "bit wrong".

The Danish actor who plays Jaime on the hit TV series, says he and actress Lena Headey are more like actual brother and sister off screen.

Coster-Waldau has spent a lot of time locking lips with Headey - his twin sister on the show - and said the pair now squirm at the sight of a kissing scene.

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"Lena Headey is brilliant as Cersei," Coster-Waldau told Red Bulletin.

"We know each other so well now that it feels weird every time when we have to do a kissing scene."

"So as soon as they yell cut we make faces of disgust, not seriously, but it does feel a bit wrong."

The show created a stir in season four when Jamie and Cersei shared a heated moment of passion in front of the corpse of their son.

Game of Thrones season six is due to be released in New Zealand on April 24.

- AAP