Cold Water Shrinkage

Japanese zookeepers have finally worked out why two of their polar bears have not mated. The bears have both turned out to be female.

Tsuyoshi, a four-year-old "male" polar bear, and his 11-year-old female partner, Kurumi, have been living together since June at the Kushiro Municipal Zoo in Hokkaido, northern Japan.

The frustrated amateur zookeepers played Barry White music and shown porno movies but still the bears showed no signs of chemistry.

It had determined Tsuyoshi was a male three months after his/her birth and now the poor bear has a boy's name and a penis complex.