Blanket reassurances based on anecdotal evidence are comforting, but fail to take account of the capricious application of laws in Dubai and elsewhere in the Gulf. I have any number of UAE-based friends and colleagues who cohabit with partners. They are pretty blasé about their situation, but they do know that unexpected events - pregnancy, denunciation - could leave them vulnerable to deportation, or worse. They know because their employer's HR department tells them so.
The recent case of the hapless Scottish lad who faced jail after another fellow claimed he'd been touched inappropriately by the young man in a bar highlights the risk to gay visitors. The "victim" withdrew his complaint when he understood the serious implications of his actions, but the authorities went along with a prosecution until interrupted by an edict from on high.
So I guess the answer is enjoy yourself, but don't get lulled into a sense of false security. Be circumspect in your behaviour, gay or straight.