Last week police and forensic experts broke into the grave after an anonymous phone call to a TV show said the truth about Emanuela's 1983 disappearance would be 'found there'.
And although bones not belonging to the mobster were recovered they have not yet been positively identified as hers.
However Father Amorth, in an interview with La Stampa newspaper, said: 'This was a crime with a sexual motive.
'It has already previously been stated by (deceased) monsignor Simeone Duca, an archivist at the Vatican, who was asked to recruit girls for parties with the help of the Vatican gendarmes.
'I believe Emanuela ended up in this circle. I have never believed in the international theory (overseas kidnappers). I have motives to believe that this was just a case of sexual exploitation.