The first single complaint about Charles William Davidson made about six years ago culminated this week in a second jury finding the masseur guilty of sexually assaulting and raping women as they lay on his massage table.

Davidson was first jailed in March 2018 after being found guilty of 18 counts of sexually assaulting 10 women and raping one in 2014 and 2015.

A jury sitting in a Brisbane court this week found him guilty of seven counts of rape and 30 of sexual assault involving 16 women, and three counts of indecent treatment of a 15-year-old girl.

It was while offering massage services he committed the offences which included tweaking and twisting of nipples, inappropriate touching of groin areas, as well as digital penetration.

They occurred over 12 years from when Davidson was aged 53.

Two women were sexually assaulted while the masseur was providing remedial massages at his home, while the other offences were committed in physiotherapy, chiropractic and beauty clinics around Brisbane and Hervey Bay.

Davidson wasn't deterred when his contract with one physiotherapy practice was terminated when a woman complained about his actions.

Describing him as a "sexual predator", prosecutor Judy Geary said the masseur "systematically exploited (the women's) vulnerability for his own sexual gratification".

"He's persistent in the offending ... and he's demonstrated absolutely no remorse in any way," she added.

In making submissions on his sentence, Ms Geary said there were no comparable decisions with "this extent of offending".

She said the women - some who had never had a massage before - were left confused and humiliated by Davidson's actions.

Brisbane District Court Judge Julie Dick said Davidson's behaviour was a "significant betrayal of trust".

"You were persistent and brazen," she told him in handing down his sentence on Thursday.

"These women disrobed to get a remedial massage: They are in a vulnerable position. They can't jump up and run out into the waiting room," Judge Dick said.

She said it was the brazenness that may have been "part of the thrill" for Davidson.

"You have otherwise had a good life, a good history, but unfortunately you have a weakness and that weakness is that you couldn't resist exploiting once you started the massage therapy," she added.

Judge Dick told Davidson he had really damaged his profession.

"You damaged the reputation of other massage therapists who don't deserve that and you probably affected the practices where you were contracted to," she said.

Davidson emigrated from Scotland with his family in 1955 and is likely to be deported after serving his sentence.

Judge Dick sentenced Davidson to four years in prison for the seven rape charges, to be served cumulatively with the sentence imposed after the earlier trial.

He will be eligible to be considered for parole on June 2 next year.

Australian Associated Press