If in proceedings for an offence to which this section applies it is proved—
that the defendant did the relevant act,
that any of the circumstances specified in subsection (2) existed, and
that the defendant knew that those circumstances existed,
the complainant is to be taken not to have consented to the relevant act unless sufficient evidence is adduced to raise an issue as to whether he consented, and the defendant is to be taken not to have reasonably believed that the complainant consented unless sufficient evidence is adduced to raise an issue as to whether he reasonably believed it.
The circumstances are that—
any person was, at the time of the relevant act or immediately before it began, using violence against the complainant or causing the complainant to fear that immediate violence would be used against him;
any person was, at the time of the relevant act or immediately before it began, causing the complainant to fear that violence was being used, or that immediate violence would be used, against another person;
the complainant was, and the defendant was not, unlawfully detained at the time of the relevant act;
the complainant was asleep or otherwise unconscious at the time of the relevant act;
because of the complainant's physical disability, the complainant would not have been able at the time of the relevant act to communicate to the defendant whether the complainant consented;
any person had administered to or caused to be taken by the complainant, without the complainant's consent, a substance which, having regard to when it was administered or taken, was capable of causing or enabling the complainant to be stupefied or overpowered at the time of the relevant act.
In subsection (2)(a) and (b), the reference to the time immediately before the relevant act began is, in the case of an act which is one of a continuous series of sexual activities, a reference to the time immediately before the first sexual activity began.