Vintage Motion Battery Operated Man Woman Having Sex Bathtub Japanese Singing

Description

Here is the video:
https://youtu.be/MT4tqD--xwg
This is an absolute conversation piece. I have never come across something like this. The bottom is marked "brothers toys." It is battery operated and it works.
This could possibly be from an Asian country and looks to be 1970s.
When you turn it on, the man and woman begin to "do it."
The music that comes out of this things is insane! It is 3 or 4 different songs of fast-paced Japanese music and a lady singing. There is no volume control and it is loud.