(1) A person who, for the purposes of extortion, accuses or threatens to accuse any other person, whether living or dead, of an infamous offence, is liable on conviction on indictment to imprisonment for 10 years.
(2) In this section “infamous offence” means any indictable offence, or indecent assault, or unnatural connection with a person or animal, or an attempt to commit, or aiding and abetting of, or conspiracy for, any such offence.