Law professor Tey Tsun Hang was found guilty on all six counts of corruption in the sex-for-grades case.
Chief District Judge Tan Siong Thye, who delivered his verdict on Tuesday, said: "I find the accused guilty and he is to be convicted on all the six charges."
He was satisfied with prosecution's position that Tey had corrupt intent, knew what he was doing was wrong, but persisted in "'taking advantage of" his former student Darrine Ko.
The chief district judge also noted that Tey had made no attempt to reimburse Ms Ko for the items she had bought him, and had "tricked her into having sex with him".
He said Tey was "not a truthful witness", as he had lied on numerous occasions.
He also did not believe Tey's defence that he was in a "loving, romantic relationship" with Ms Ko and pointed out that Tey did not say he loved Ms Ko in any of his six lengthy statements to anti-graft officers, and did not refer to Ms Ko by name either, when asked about the sexual episodes.
"'The accused was not affectionate in his written communication (with Ms Ko). He was terse in his emails, to the point of being curt,'" he added.
Lawyers for Tey are now in the midst of making his mitigation plea.