Sun, the mother of a 12-year-old boy, blushed in embarrassment as her son giggled at what she considered a sexually explicit joke in an advertisement displayed inside one of the city's No 347 buses.

Last Friday, a Beijing Times reporter found three similar ads inside some No 347 and 331 buses.

One ad read, "A male and female statue had stood face to face for years. One day, Cupid freed them for 15 minutes to do what they must have desired for so long but couldn't. In no time, the two statues ran to a secluded area and."

Alongside this, two other ads entitled "No Vigour for Husbands" and "Angry Partner" offered subscriptions to a pornographic short message service for cellphone users.

Sun said she worried about the vulgar ads' negative influence on children.

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