(1) An adult who has sexual intercourse with a minor who—
(a) is employed by the adult;
(b) receives wages or salary directly or indirectly from the adult,
commits an offence and is liable on conviction on indictment to imprisonment for 25 years.
(2) An adult is not guilty of an offence under subsection (1) if the minor is the spouse of the adult.
(3) If a marriage is declared invalid by a Court of competent jurisdiction the invalidity does not make a person guilty of an offence under this section because that person has sexual intercourse with a person who he or she believes to be his or her spouse, and has reasonable cause for the belief.