TORONTO - Toronto police have charged a 75-year-old man with sex assault and child porn offences they say relate to affiliations with nudist organizations.

Police say that between 1969 and 1985, the accused took sexually explicit photographs of more than 40 children from 10 countries.

It's alleged the man had sex with many of the children.

Police say he gained access to children through his affiliation with various nudist organizations around the world.

Julian Mardon of Toronto has been charged with child porn, obscenity and sexual offences.

He was due in court today.