The upper house of the Swiss parliament has drafted a law decriminalising sex between consenting family members which must now be considered by the government.
There have been only three cases of incest since 1984.
Switzerland, which recently held a referendum passing a draconian law that will boot out foreigners convicted of committing the smallest of crimes, insists that children within families will continue to be protected by laws governing abuse and paedophilia.
Daniel Vischer, a Green party MP, said he saw nothing wrong with two consenting adults having sex, even if they were related.
"Incest is a difficult moral question, but not one that is answered by penal law," he said. Read more