Lieutenant Commander John Alan Jones has been found guilty of seven acts of indecency against a junior female sailor.
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The verdict was handed down by a court martial in Fyshwick at 10am today.
In one incident Jones had pulled the victim's stockings and underpants down to expose her genitals and buttocks, told her to lie across his lap and then spanked her bare buttocks a number of times.
The court had been told Jones had repeatedly spanked the sailor without her consent between February and October 2010.
Jones was acquitted of another two indecency charges.
He had earlier pleaded guilty to attempting to destroy a navy lap top containing spanking pornography.
Jones had been the supply officer aboard HMAS Sirius when the offences were committed.
He is expected to be sentenced tomorrow.