The British couple's marriage has now been annulled by the High Court after judges ruled the marriage had never validly existed.
The identities of the brother and sister and details of how they fell in love and married are being kept secret.
Soon after they were born they were separated and adopted by different families.
Neither was told they had a twin and had no idea they were blood relatives until after their wedding.
Pam Hodgkins from Adults Affected by Adoption said: "Incest is one of the strongest taboos in our society. But we are always attracted to a partner who is like us.
"And nobody can be more similar than a biological twin."OMG.
Where most people see DANGER, I see a CHALLENGE!
