Stuart James McDonald, from Adelaide, was on trial in the South Australian Supreme Court, after he failed to tell the eight men he had HIV, Australian news agency AAP reported.
A jury Monday found him guilty on two of the eight counts of endangering lives.
All eight men tested positive for HIV after having receptive anal sex with McDonald in 2005, the court was told.
McDonald met four of his victims via a website, three at Adelaide's Veale Gardens and one at a gay boarding house in the city.
Some of the men believed McDonald was using a condom - only to realise later he had failed to do so or had taken it off during sex, the court was told.
Published 13 December 2010, 08:10 IST