Some additional resources on sexual consent law in the UK:
News report, The Telepgraph Jan 28th 2015 (relevant passage extracted below, italic emphasis, ours):
“Consent to sexual activity is not a grey area – in law it is clearly defined and must be given fully and freely.
It is not a crime to drink, but it is a crime for a rapist to target someone who is no longer capable of consenting to sex through drink.
These tools take us well beyond the old saying ‘no means no’ – it is now well established that many rape victims freeze rather than fight as a protective and coping mechanism.
We want police and prosecutors to make sure they ask in every case where consent is the issue – how did the suspect know the complainant was saying yes and doing so freely and knowingly?”
Mrs Saunders (the Director of Public Prosecutions or DPP) who was speaking at the first National Crown Prosecution Service/Police Conference on Rape Investigations and Prosecutions in London, said the guidance should not only cover situations where someone is incapacitated through drink or drugs, but also where “a suspect held a position of power over the potential victim – as a teacher, an employer, a doctor or a fellow gang member”.
Some resources on the concept of Enthusiastic Consent: