The sentencing judge said Pooley's worst offending was against a girl, aged seven to 11 at the time.
Representing himself before the Court of Appeal, Pooley argued his prison sentence was excessive and a community work sentence would be more appropriate.
He said he was persuaded to plead guilty but was later appalled at the allegations made against him, saying he got "a bit of a raw deal" at sentencing.
Pooley argued the seriousness of the allegations was exaggerated, and claimed his principal victim had initiated the relationship.
His partner was the best thing in his life and there was no possibility he would offend again, he said.
The Court of Appeal dismissed his appeal, saying his submissions indicated an "alarming lack of insight".
While he had shown some remorse, he had a lack of insight into the seriousness of his offending and the ongoing harm it had caused his six victims, the Court found.
There was a risk he would offend again, despite his age, and the minimum non-parole period was appropriate to protect the community and deter him from further offending.