Conor McRedmond and Rebecca Blake pleaded guilty to consumption of alcohol in public, but they pleaded not guilty to charges of breach of honor with consent and committing an indecent act in a taxi, The Independent reported Friday.
However, they were convicted despite DNA tests failing to find traces of intercourse in the taxi cab.
A lawyer representing the pair said Thursday they were sentenced to three months in jail followed by deportation.
Police said Blake was straddling McRedmond in the back of the taxi and was "moaning for two minutes and making the sounds of a woman having sex."
The driver beckoned over a police officer who saw the pair engaging in sexual intercourse, police said.
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