UAE is a Muslim country and is administered according to religious laws; thus, cultural opinions are in stark contrast to the west. Regardless of gender, stick to modest attire that doesn't expose the skin unnecessarily. Clothes should conceal both legs and arms.
One should also be mindful of their conduct in public! PDA is to be avoided when out and about. Apart from holding hands (even that should be limited), any other public affection is prohibited. Big penalties, confinement, and deportation will ensue if you blatantly disregard their cultural norms. Homosexuality is prohibited. It is a criminal offence in Abu Dhabi according to Islamic law; so, one should be discreet if visiting the city.