Mr Ravelich said his client has received his first injection of the libido-suppressing drug zoladex in February and had noticed an effect.
"There's been considerable physical changes in him, and a reduction of the urges he has had to live with," he said in court.
"He no longer fantasises or visualises like he used to and he is no longer physically capable of being aroused."
Judge Wade said Hona was an "incorrigible flasher" and said a prison sentence would deny him access to the drug that could be effective in managing his sex drive.
Hona was sentenced to 18 months intensive supervision.
Outside court Mr Ravelich said he had represented Hona for many years and that he had "slipped through all the cracks".
He said while zoladex was not available through district health boards, the Department of Corrections made it available to some recidivist sex offenders.
"It has been proven in places like Canada to reduce the rate of re-offending... I just hope it works for him and there won't have to be any more victims," Mr Ravelich said.