The Italian journalist who was on trial for publishing confidential Vatican documents has released another book documenting gay sex in the Vatican's youth seminary and the vast amounts in Mother Theresa's bank account.

Gianluigi Nuzzi told reporters a copy of Original Sin, that went on sale on Thursday, had been sent to the Vatican's chief prosecutor over allegations of sex involving a child inside the Holy See, according to Crux.

The Vatican did not immediately comment on the accusations.

Nuzzi said Mother Theresa's account with the infamous Vatican bank was so large that the whole institution would have collapsed if she withdrew her funds. However the Calcutta-based missionary trusted the officials although they were 'more acquainted with the jet set of the world of film' than 'the poor of Mother Teresa', Nuzzi claims.

The journalist also discusses the alleged gay-subculture in the Vatican's St Pius X pre-seminary for middle and high schoolers considering the priesthood. The book includes a letter from a now gay ex-seminarian who described how a priest used to come into their dormitory at night to have oral sex with one of his roommates, who was under 18 at the time.

Neither the roommate nor the priest were identified.

The book comes after Nuzzi along with fellow journalist Emanuele Fittipaldi were put on trial by the Vatican for publishing books based on illegally leaked documents that exposed greed, mismanagement and corruption at the highest levels of the Catholic Church. In July 2016, after an eight-month trial, the Vatican's criminal court declared that it had no jurisdiction to prosecute them.