what was the United States opinion on having female spies in world war 2? what about Germany & Japan?

Answer 1

They were very much in demand by all warring parties, because they could move about about in occupied territory much more unhindered then men.

One famous example is Virginia Hall :

"Virginia Hall initially joined the Department of State as a clerk. After she was turned down for a position in the foreign service due to her gender and a disability, she went to Europe and operated with elements of the French underground as the first female field officer. She returned to the OSS fluent in German and French, and with a knowledge of Morse code. This and her ability to work a wireless radio made her a most valuable asset to the OSS. Maintaining her cover as a milkmaid, she delivered milk to German soldiers to learn invaluable information. After the war, she became one of the CIA's first female operations officers." ("Clandestine Women: The Untold Stories of Women in Espionage ")

Answer 2

I know the U.S.A. had female spies during the Civil and Revolutionary Wars and I'm sure before that. During WW1 there was a famous spy named Mata Hari. I don't have any names of spies in WW2, but they were definitely there.