Three cases of serious sexual offences were discontinued in court last month.
The Director of Public Prosecutions says of the 3 cases, one was discontinued due to a false complaint by the victim.
Two cases were discontinued after the deaths of the accused persons.
13 people were charged with a total of 27 separate incidents of sexual offences in November.
The DPP says there were 22 cases of rape, 1 case of attempted rape and 4 cases of sexual assault.
One of the accused persons was under the age of 18 years.
8 victims of serious sexual offences are under the age of 18 years.
There were 4 sexual offences where the victims were related to the accused person.
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