Indonesia's parliament has approved a new criminal code that bans anyone in the country from having extramarital sex and restricts political freedoms.
Sex outside marriage will carry a jail term of up to a year under the new laws, which take effect in three years.
The raft of changes come after a rise in religious conservatism in the Muslim-majority country.
Critics see the laws as a "disaster" for human rights, and a potential blow to tourism and investment.
They apply equally to locals and to foreigners living in Indonesia, or visiting holiday destinations such as Bali. Under the laws, unmarried couples caught having sex can be jailed for up to a year.
Sex before marriage was already banned prior to the approval of this new criminal code, but the law was often not enforced.
The old law defined adultery as sex between a married man and someone who was not his wife, while the new law bans all sex outside of marriage, including between unmarried couples. The sentencing for those caught has also been increased from nine months to a year.
Supporters of the new legislation say changes were made to accommodate concerns of critics - for prosecutions to start a complaint must be filed by the children, parents or spouse of the accused couple.
Ajeng, a 28-year-old Muslim woman living in the West Java city of Depok, said she was now at risk for living with her partner for the past five years.
"With the new law, both of us can go to jail if one of the family decides to make a police report," she told the BBC.
"I think living together or having sex outside of marriage is not a crime. In my religion, it's considered a sin. But I don't think the criminal code should be based on a certain religion."
She said she had joined the nationwide protests in 2019 when the law had first been broached. She took the sign: "For the right to cuddle, I took to the streets."
However on Tuesday, parliament unanimously approved the new code of over 600 articles.
Rights groups say the new provisions disproportionately affect women, LGBT people and ethnic minorities.
Many businesses had also been opposed to the legislation, saying it discouraged visitors and investment. But lawmakers have celebrated overhauling laws dating back to Dutch colonial rule.
The new legislation contains scores of new clauses criminalising immorality and blasphemy and restricting political and religious expression.
Human Rights Watch's Asia Director Elaine Pearson told the BBC it was a "huge setback for a country that has tried to portray itself as a modern Muslim democracy".
The group's Jakarta-based researcher, Andreas Harsano, said there were millions of couples in Indonesia without marriage certificates "especially among Indigenous peoples or Muslims in rural areas" who had married in specific religious ceremonies.
"These people will be theoretically breaking the law as living together could be punished up to six months in prison," he told the BBC.
He added that research from Gulf states, where there are similar laws governing sex and relationships, showed women were punished and targeted by such morality laws more than men.
There are now also six blasphemy laws in the code, including apostasy - renouncing a religion. For the first time since its independence, Indonesia will make it illegal to persuade someone to be a non-believer.
New defamation articles also make it illegal for people to insult the president or criticise state ideology.
However legislators said they had added defences for free speech and protests made in the "public interest".