A Sydney psychiatrist has been suspended for misconduct including telling an alleged child sex offender 'in other countries it is legal' and 'back in Greek times it was OK'.

Dr Ian De Saxe also was found to have told the patient: 'I'm willing to lie for you and willing to write you a report. Get your solicitor to contact me and I will talk to him'; and to have invited the patient to perform oral sex on him.

The NSW Civil and Administrative Tribunal on Tuesday found him guilty of professional misconduct in relation to three patients and suspended him from practice 'forthwith'.

Sydney psychiatrist has been suspended for misconduct involving a paedophile (stock image)

He admitted misconduct with two patients, but disputed claims by a third man who was treated at a private hospital on Sydney's lower north shore and whose evidence was accepted by the tribunal.

It accepted that De Saxe made inappropriate comments to the patient, who had a psycho-sexual disorder, and was facing criminal charges related to indecently assaulting a 15-year-old boy.

They were: 'society doesn't always understand the way things are but it's OK'; 'it was all right to do this'; 'in other countries it is legal'; 'back in Greek times it was OK'; 'it should be allowed'; 'I don't agree with the law'; and that the conduct 'wasn't that bad'.

In his testimony to the tribunal De Saxe stated he may have made comments to try to comfort the patient.

'During his evidence, the practitioner expressed views (that) clearly indicated that sexual conduct between adult males and post-pubescent youths was not untoward,' the tribunal said.

The misconduct with the first patient involved De Saxe engaging in inappropriate sexual contact with him, and failing to stop treating him after the first incident.

Other complaints related to circumstances surrounding his prescribing drugs of addiction to the first and second patients.

He also had offered to massage the legs of the second patient and at one stage asked: 'Do you want me to go any higher?'