The Court of Misdemeanours sentenced two men and three women to one year each in prison for having sex outside of marriage, the Khaleej Times reported.
According to the 7 Days newspaper, the two men were policemen.
All the defendants were fined 2,000 dirhams ($550, 500 euros) each for "getting together while unrelated in a way that would lure them into committing acts of sin," the Khaleej Times said.
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Nine were fined an additional 2,000 dirhams each for consuming alcohol without a licence at the party on the yacht anchored in Dubai Marina in October, according to the newspaper.
Police raided the party after a tipoff and seized about 110 bottles of alcohol as well as bedsheets and other evidence for forensic tests, it said.
The 15 men, aged between 21 and 43, were from the UAE, Iran and the Comoros, while the women, aged between 20 and 36, were from the UAE, Yemen, Oman, Saudi Arabia and Morocco.