A new law mandating death by stoning for adulterers in Indonesia's deeply Islamic Aceh province advocated "torture" and should be overturned, US-based group Human Rights Watch said on Monday.
"Stoning and flogging constitute torture in any circumstances," said Elaine Pearson, the head of Human Rights Watch Asia.
"Imposing these draconian punishments on private, consensual conduct means the government can dictate people's intimate lives."
The law - which also allows punishments of up to 400 lashes for child rape, 100 lashes for homosexual acts and 60 lashes for gambling - was passed unanimously last month in the staunchly Islamic region.
It is yet to be approved by the provincial governor and is opposed by the central government in Jakarta.
The law, based on local interpretations of Islamic or sharia law, is supposed to replace elements of Indonesia's criminal code.
It allows the death penalty for a married person and 100 lashes for an unmarried person found guilty of adultery.
Human Rights Watch urged the central government and a new incoming local parliament in Aceh to overturn the law.