No physical evidence could be found to back up singer Robbie Klay's claims on being sexually molested as a child, a medical doctor testified on Thursday.

Dr Lorna Jacklin of the Child Abuse Clinic, who testified in the High Court in Pretoria, said Klay had told her singer Jurie Els had sexually assaulted him.

He said this began with nakedness after bathing and sexual touching, progressing to pornography, masturbation and eventually anal and oral penetration after he turned 12.

Jacklin said she examined Klay in February this year at the request of the investigating officer in the case.

The 23-year-old Klay in court claimed Els had repeatedly sodomised and indecently assaulted him before he turned 12 and carried on with his actions until he turned 18.

Dr Jacklin said her impression was that Klay struggled with his sexual orientation, as he told her he had sex with many girls to prove his ability to have a male-female relationship.

She testified Klay had no abnormalities, apart from a "mildly decreased anal tone" and a haemorrhoid.

Her findings could not be specifically attributed to the penetration that allegedly occurred, she said.

Klay earlier in the morning faced a fourth day of tough cross-examination.

This saw him answering many questions with long silences, often battling to find replies to queries on apparent inconsistencies in his evidence.

He could also not explain why his memory now differed from what he remembered when he made a statement to the police in February last year.

Klay admitted being an active partner in the acts of sodomy but could not think of any reason why he had not mentioned this in his evidence in chief.

He conceded two of the alleged incidents he testified about — once while Klay's mother was sleeping in a nearby room and once at a Midrand hotel — occurred after he turned 16 and was "irrelevant" for purposes of the trial.

Els has pleaded not guilty to two charges of indecently assaulting Klay when he was between the ages of 12 and 16 and soliciting Klay to commit indecent acts while he was a minor.

The trial continues.

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