Zou denies 11 counts of rape as well as three counts of voyeurism, 12 counts of possession of an extreme pornographic image, one of false imprisonment and eight of having a controlled drug with intent to commit a sexual offence.
The prosecution said it was one of a series of drugs found when his home was raided and searched, which Zou used to stupefy and subdue women so he could carry out his attacks.
An engineering student accused of drugging and raping women has said he took drugs and viewed pornography, with his favourite scenes involving sleeping women.
Questioned about video material he watched, the PhD student at University College London said he liked “time stop” pornography, in which “the females are passive and unresponsive during sex”, according to a definition agreed by the defence and prosecution.
After his arrest, Zou told police: “Firstly, I wish to say that reference has been made to pictures retrieved from my mobile phones, however I have not seen these and I do not recall when and where I took them.
