SEXY PALACE
http://www.hkmdb.com/db/movies/view.mhtml?id=10131&display_set=eng

Vcd screenshots:

1st photo: title: 唐朝禁宮酷刑
(there was not in the Database. I added it)

2nd photo: director: Ng Ga Kui 吳家駒

3rd and 4th photo: stars. For the moment, I only recognized the symbols of the 3 last ones:
葉卿萍 - 李美娟 - 洪彩菱
yip hing ping - Lee Mei Guen -hung choi ling

I think they only did soft porno films as this
They were not in the Db and I added them.

I think all is correct.

Found another porno star.

chung choh wang 鐘楚宏

(new name)
Added.

Also found that "Summary" says:
Summary
1993 is estimated year. Starring: Yip Hing Ping, Choi Ling Hung, Mei Yuen Lee

Some names of the porno stars of the film are "reversed". If nobody objects in 15 days, I will delete that names from the Summary.