.
We do come across, from time to time, JAVs where a woman is humiliated, and the peeing-into-the-mouth business is just one of her trials and tribulations.
Recently came across
Policewoman Squeezed Negotiator M-6 (Captured by Terrorists) [CMN-118], with the wonderful
Marina Matsumoto, where the twist was that she was forced to drink (what I presumed to be urine, as the vial was filled off-screen) from a tube.
But that was an isolated scene, and you are looking for movies devoted to the subject.
I went to Google Translator, and by finding the Japanese for...
Golden showers
... and by pasting it into DMM's search box...
...I found this:
http://www.dmm.co.jp/search/=/searc..._/n2=Aw1fVhQKX19XC15nV0AC/sort=ranking/view=/
There is a lot of unrelated fare one would need to wade through, such as the femdom ones where the man is the victim, but through a glance, there should be live ones, such as perhaps:
Pervert Public Toilet Tantsubo Meat Urinal Woman [MGQ-005], starring
Risa Sanada (aka
Madoka Adachi)
EDIT: A subsequent look at the movie's screen shots (below) reveals this one may not concentrate on the "in the mouth" aspect, either... despite the cover's promise.
http://img19/th/04475/4y1cisbx141u.jpg
In addition, via the Japanese for "
Pissing"...
... And for "
Peeing."
.