The petition had been filed in 2015 by 33-year-old lawyer and radio show host Jesus Nicardo M. Falcis III and the LGBTS Christian Church Inc.
Falcis sought to challenge provisions in the country's Family Code that defined marriage as a "permanent union between a man and a woman." He also challenged clauses declaring homosexuality as grounds for legal separation and declaring concealment of homosexuality at the time of marriage as an act of fraud that constitutes grounds for annulment.
According to CNN, Falcis said he "decided to use the tool of litigation, because it has been successful in other countries -- such as the United States -- to have gay marriage legalized."
However, the Supreme Court unanimously rejected the petition in September, saying he lacked legal standing and had failed "to raise an actual, justiciable controversy."
The court acknowledged that LGBT people in the Philippines have faced discrimination in the past and said the Constitution does not explicitly prohibit same-sex marriage. However, it said questions of defining marriage should be handled by the legislature.
"Adjudication assures arguments between parties with respect to the existence and interpretation of fundamental freedoms. On the other hand, legislation ideally allows democratic deliberation on the various ways to assure those fundamental rights," the court said, according to the Philippine News Agency.