The man, 35, was not required to plead to the charges, which include sexual penetration of a child who was a relative and encouraging a child to engage in sexual behaviour.
Of the 51 charges in total, he is facing 20 counts of indecently dealing with a child who was a relative and 12 counts of indecently dealing with a child under 13 years of age.
The man, who cannot be named for legal reasons, was charged on Tuesday by detectives from the Child Abuse Squad.
He was remanded in custody until Thursday when he is expected to make a bail application.
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