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Max Kelly, 25, said he had a medical condition which made them swell to four times their normal size.

Bosses at the fashion store in Aberystwyth, mid-Wales, called police after two groups of girls complained they had seen him drop his pants and trousers.

After his arrest Kelly claimed he suffered from a rare swollen testicle complaint called hydrosil.

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He said it 'makes him very uncomfortable' and 'perhaps he was adjusting himself'.

But Ian Ibrahim, prosecuting, told a jury at Swansea Crown Court Kelly 'deliberately exposed his penis'.

Witnesses described him 'moving up and down and shaking it in a fast motion'.

"He was wearing a pair of sunglasses and that made him quite distinctive,'' the prosecutor said.

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"He was following them around so the prosecution say that it was not possibly an accident.

"The fact that he was following them around and exposed himself on two occasions shows that it was deliberate."

Jobless Kelly denies two charges of indecent exposure.

The trial continues.