Searching for the Stork

It's hard to be against motherhood, but Japan, a country with a falling birthrate, may have found a way. When television variety-show host Aki Mukai and her husband, former professional wrestler Nobuhiko Takada, announced the birth of their twin boys last Tuesday, they drew fresh attention to the country's restrictive law surrounding surrogate mothers. Due to a 41-year-old Supreme Court ruling, Mukai, 39, can't be registered as the twins' biological mother, because the couple used a surrogate to give birth; to be recognized, she must legally adopt the twins.

Mukai, whose bout with cervical cancer three years...