A woman who performed oral sex on a teenage boy while he was passed out at a party has failed in her bid to have her sexual abuse conviction quashed.

South Australian mum Cynthia Frahn, 53, had been found guilty of the sexual abuse of a 15-year-old.

The incident took place at her home in Monarto, 63km southeast of Adelaide, in June 2023, news.com.au reports.

During her trial, a jury was told the teenager had passed out in a tent during a party at Frahn’s home before waking to find her performing the sex act on him.

She was sentenced to four years in jail, with a non-parole period of two years and six months.

Frahn then attempted to have her conviction and sentence overturned due to her claim the judge had made ‘the prosecutor’s fallacy’, a logical error.

Her appeal took issue with the way that DNA evidence had been presented to the jury during the trial but this claim was thrown out.

Her appeal also argued there was a mistake in the DNA evidence that was part of the circumstantial case against her, namely samples from Frahn and the teen’s clothes.

Cynthia Frahn (pictured) performed oral sex on a 15-year-old boy while he was passed out 

Her solicitor told the appeal panel this was ‘equally capable of being explained by innocent transference in undisputed circumstances’. 

But the panel chose to uphold her conviction and sentence, rejecting her case.

‘It was consistent with the verdict for the judge to find that the complainant was not willing and did not acquiesce in the applicant’s acts,’ the judgment read. 

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Sexual Assault Support Services on 6231 1811. After hours 6231 1817