Old Japanese movie.

Hi, I’m trying to find the name of a Japanese movie I saw over 30 years ago on television. My recollection of it may be vague, but it was a hilarious comedy of a Japanese man, running a number of prostitute houses, who in the second half of the film, when WWII broke out, tried to help out the Japanese emperor by fathering as many male children as possible with the prostitutes somewhere on an island as to build an army for Japan. That’s about all I can remember after 30 years…