
Allan George Matthews, 56, admitted "removing tissue" from the 52-year-old "without consent or authority" in Port Macquarie, north of Sydney, in May, a local court in the town heard Wednesday.
Police alleged that Matthews was not a qualified or registered doctor.
Python bites Thai man's penis in terrifying toilet encounter
The other man, who was not named, posted the ad because he could not afford a proper medical procedure for the testicle, which had troubled him since being kicked in the groin some years ago, Sydney's Daily Telegraph reported.
Matthews also pleaded guilty to several other charges including illegally possessing a gun, with police saying they became aware of the case in late June when the man went to a hospital for treatment on a wound he suffered during the operation.
He is due back in court in August.
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