NEW DELHI, March 12 (Reuters) - The Indian government opposes recognising same-sex marriages, it said in a filing to the Supreme Court on Sunday, urging the court to reject challenges to the current legal framework lodged by LGBT couples.

The Ministry of Law believes that while there may be various forms of relationships in society, the legal recognition of marriage is for heterosexual relationships and the state has a legitimate interest in maintaining this, according to the filing seen by Reuters, which has not been made public.

"Living together as partners and having sexual relationship by same sex individuals ... is not comparable with the Indian family unit concept of a husband, a wife and children," the ministry argued.

The court cannot be asked "to change the entire legislative policy of the country deeply embedded in religious and societal norms", it said.

"As petitioners we have received wide support from people from all walks of life and it does not seem to me that most Indians feel injured by the thought of some loving families getting legal rights," one of the litigants in the current case, businessman Uday Raj Anand, told Reuters after the government filed the reply in court.

In an historic verdict in 2018, India's top court decriminalised homosexuality by scrapping a colonial-era ban on gay sex. The current case is being seen as a further important development on LGBT rights in the country.

At least 15 pleas, some by gay couples, have been filed in recent months asking the court to recognise same-sex marriages, setting the stage for this legal face-off with Prime Minister Narendra Modi's government.

"Sad that their concept of 'Indian' is so non-inclusive and static that it does not want to evolve according to wider notions of human rights," filmmaker and equal rights activist Onir wrote on Twitter.
CASE MARKS MILESTONE

Asia largely lags the West in accepting same-sex marriage.

Taiwan was the first in the region to recognise such unions, while same-sex acts are illegal in some countries, such as Malaysia. Singapore last year ended a ban on gay sex but took steps to bar same-sex marriages.

Japan is the only country among the Group of Seven nations that does not legally recognise same-sex unions, although the public broadly favours recognition.

In India, the issue of same-sex marriage is sensitive: speaking openly about homosexuality is taboo for many in the socially conservative country of 1.4 billion people.

The issue has stoked emotions in the media and in parliament, where a member of Modi's ruling Hindu nationalist party in December asked the government to strongly oppose the petitions filed in the top court.

LGBT activists say that while the 2018 ruling affirmed their constitutional rights, it is unjust that they still lack legal backing for their unions, a basic right enjoyed by heterosexual married couples.

In Sunday's filing, the government argued the 2018 ruling cannot mean recognising a fundamental legal right to same-sex marriage under the laws of the country.

The intent behind the current legal system on marriage "was limited to the recognition of a legal relationship of marriage between a man and a woman, represented as a husband and wife."

The government has argued that any change to the legal structure should be the domain of the elected parliament, not the court.

The cases are set to be heard in the Supreme Court on Monday.