(1)It is a defence to a charge in proceedings under section 42 that A reasonably believed—
(a)that B had attained the age of 18, or
(b)that B was not a person in relation to whom A was in a position of trust.
(2)It is a defence to a charge in proceedings under section 42—
(a)that B was A's spouse or civil partner, or
(b)that immediately before the position of trust came into being, a sexual relationship existed between A and B.
(3)Subsection (2) does not apply if A was in a position of trust in relation to B by virtue of section 43(6).