It seems to be not only alcohol...
Gulf News reported:

The two men, together with a third, were alleged to have engaged in continuous binge drinking and offensive behaviour throughout the journey.

It was alleged that despite repeated requests and warnings the three men continued to behave inappropriately causing significant concern to staff and passengers. It was also alleged that at one point, the need to divert the flight in order to resolve the situation was considered.

David Andrew Evans was found guilty of sexual assault and was sentenced to a twelve-month custodial sentence, suspended for three years. He had also been charged with public exposure and indecency after allegedly removing his clothing and repeatedly exposing himself during the flight.

Jeremy (Harvey David) Snaith was convicted of sexual harassment and given a three-month custodial sentence, suspended for three years.

He had also been charged with unlawful consumption of cocaine and hashish after traces of both were returned in a positive drugs test. He was also charged with the use of offensive language in a public place. It was deemed by the court that Snaith's positive drug test was the result of consumption prior to his departure for the United Arab Emirates.

The court heard testimony from one of the female cabin crew who had been a victim of the ordeal. Evidence was provided of a catalogue of offensive, sexually-orientated acts committed under the influence of alcohol. These ranged from unwelcome advances to actual sexual assault.

A third man, Wiliam Sargent, was acquitted on two charges - the unlawful consumption of temazepam and the use of offensive language in a public place.

Speaking in response to the verdicts, Etihad Airways spokesperson Iain Burns said, "Etihad Airways will continue to treat reports of alleged assault on our staff extremely seriously. We support prosecutions by the authorities, where there is sufficient evidence, anywhere in the world. The safety of our customers and crew is our number one priority and we will continue to uphold a zero tolerance policy towards disruptive passengers."

You can find the whole article here:
http://archive.gulfnews.com/articles.../10130176.html