Detained in Dubai, a group which helps Westerners who fall victims to the Islamic country's draconian laws, said authorities have "racist" ideas about tourists and are guilty of "manipulation when it comes to criminal accusations."
Radha Stirling, the founder of the charity said: "We get people contacting us asking whether they should report a crime and - whether it be a rape or anything else - I often say no. Absolutely not."
She added: "Tourism in the UAE has increased and there is a big clubbing scene. People go there to have a good time and the country promotes this. But they do assume women are 'looking for it'.
"There is the social perception that if a woman drinks alcohol, she has consented to it [sex]. And there's also a racist mentality of thinking, 'She's British so she was probably drunk and asking for it.'"
The stark warning comes after the 25-year-old woman attacked by two men while holidaying in the country. The men allegedly befriended her and lured her into their hotel room before pinning her down and raping her while recording it on a phone.
But when the woman, whose name cannot be reported for legal reasons, went to the police she was arrested for having 'extramarital sex'.
She now faces years in prison or severe physical punishment, including flogging or stoning to death, if convicted.
The British woman has reportedly had her passport confiscated and been released on bail pending her trial.
The charges have been confirmed by the Foreign and Commonwealth Office.
Ms Stirling said it is likely the woman will be punished.
She explained: "In 2008 a woman in Fujairah, who had broken ribs and evidence of violence from being raped after her drink was spiked, was charged with sex outside of marriage and held in the country for eight months, so it's very possible this woman will be too."