That one is actually really easy to explain. This studio uses different codes for movies you can rent (stream either once or for a limited time, and back in the day DVDs you could rent at a video store) which are the SBNR ones, and codes for buying the movie (unlimited streaming or actually...
The sex scene is available uncensored on "Pearls of the Orient: Gobbling Geishas"
Back then (2003) it wasn't that odd to get the same movie censored for the Japanese market and uncensored for the US market.
Haven't been able to find the code for the censored version yet.
Isn't this against the current porn laws in Japan? The way I understood it is that under the current rules the AV contract has to list all the things that are supposed to happen in the scene, thus making real unscripted stuff impossible. Or did I misunderstand how the law works?
There's many more. DMM lists:
APNS-003, 040, 071, 087, 102, 112, 124, 151, 165, 179, 183, 200, 213, 236, 248, 275, 326, 345, 360, 363, 368, 375.
Sometimes it's a wife, sometimes a girlfriend, but other than that it's the same series.