Fashion photographer Muhammad Fadli bin Abdul Rahman and transgender friend, Noor Vitriya Kistina Ibrahim, were arrested at a shopping mall in Abu Dhabi and sentenced to a year in jail at the weekend, according to relatives.
Fadli's brother Saiful told AFP from Singapore that the pair were detained by the tourism police for "looking feminine".
Advocacy group Detained in Dubai said they were convicted of charges related to "inappropriate behaviour over their clothing". The group confirmed both were sentenced to a year in jail.
"We want them released and back to Singapore as soon as possible," he said, adding his brother was a "friendly, happy- go-lucky and jovial person."
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"We were informed that he was arrested for looking feminine, but looking feminine is very broad. It was emotional, my parents broke down when they heard the news," he added.
Rights activists in Singapore launched an online crowd- funding campaign to raise 25,000 Singapore dollars (USD 18,366) for their legal and other fees and breached their target just after midday Friday, according to their Facebook page.
Radha Stirling, head of London-based advocacy group Detained in Dubai and managing partner at the Stirling Haigh law firm, said Thursday her organisation will appeal the verdict and request the sentence be dropped to a fine and deportation.
The United Arab Emirates criminalises sodomy, as well as both pre-marital and extra-marital sex.
Article 358 of the penal code also criminalises "indecent attire" as an act of public indecency.