He was found guilty in November 2003, but the Court of Appeal quashed the conviction.
It found the judge had misdirected the jury on how it should deal with similarities in evidence from the four complainants.
Sturm is facing charges of stupefying with drugs, indecent assault on a male and unlawful sexual connection with a male.
The Crown says there four complainants were unknown to each other, and never spoke with each other about what happened.
It says they were supplied alcohol and drugs before being sexually assaulted.