The jury has now retired to consider its verdict in the case of Phillip Sturm, in the High Court at Auckland.
Mr Sturm is charged with stupefying then sexually assaulting four men in 2001 and 2002.
In his summing up, Justice Williams raised the defence argument that the claims by the four heterosexual men were motivated by embarassment at what had happened to them.
He also raised the assertion by the defence there was no evidence of GHB or ketamine being involved - drugs often associated with stupefying in sexual assault cases.
The Judge also pointed out the Crown's case that expert witnesses had set the bar too high when deciding the level of intoxication necessary before the alleged victims became unaware of what was happening to them.