Students at a school in central New South Wales were allegedly forced to engage in group sex and were hypnotised to have intercourse with teachers, a court has heard.

The allegations were made during a bail application for a former chaplain at St Stanislaus College in Bathurst.

Brian Spillane, 66, is one of several men charged after allegations of assaults dating back to the 1960s.

Earlier this year he was granted bail on 117 charges of indecently assaulting former students.

He has since been charged with another 29 offences.

In asking for bail to be revoked, the prosecutor said the brief of evidence "paints a picture of rampant paedophilia".

Spillane was granted bail and is now accused of a total of 146 charges of indecency and sexual abuse against 27 victims.