Canadian court ended hearings this Wednesday of what observers see as a case that pits freedom of expression with safeguarding children.

For refusing to carry what it deems to be sexually explicit pamphlets, Canada Post was sued by the Sex Party, the country's only accredited sex-related political party.

The party refused to put in an envelope a pamphlet that includes images of the nude back of a person copulating with someone whose legs and hands are visible, a photo of a sculpture of a penis and a drawing of two stick people engaged in oral sex.

Canada Post insists the material was too "graphic" in nature, and were concerned about children picking it up in the household mail, Agence France Presse reported.

"The government has no right to prohibit peaceful political expression," Sex Party president John Ince said, adding the postal service does not censor mail opposing homosexuality.

The Sex Party fielded three candidates, including Ince, in a 2005 election in the Vancouver district of British Columbia. They captured 0.39 per cent of the vote. Its website advocates a "Sex-positive Culture" that includes repealing "sex-negative laws."

Ince said Canada Post is crucial in future elections because it has a monopoly on deliveries to apartment buildings.