AN international pilot tried to settle a debate with his wife about circumcision by taking photos of naked boys at a popular Brisbane park on Australia Day, a court has been told.

Glenn Anthony Armstrong, 47, was arrested at South Bank Parklands yesterday after he was allegedly spotted taking a photo of a naked three-year-old boy being changed by his parents, the Brisbane Magistrates Court was told today.

When police located Mr Armstrong, a Perth-based pilot for V Australia, they allegedly found about 50 photos of naked boys on his camera.

He allegedly told police he was "obsessed with circumcision" and had taken the photos to demonstrate to his wife that more boys were uncircumcised than circumcised.

Mr Armstrong was charged with one count of indecent treatment of a child under 12.

The father-of-two appeared in the Brisbane Magistrates Court today where he was granted bail upon providing a $5000 surety.

The matter will next be mentioned in February.