Scenes from Spanish film Slam (2003).
Full movie is available on YT (age restricted):
Youtube Video
Timestamps: 1:22:45-51, 1:23:07-45
More scenes: 1:06:07-39, 1:13:05-10, 1:28:29-47
They aren't full-on sex scenes unfortunately.
Chained guy is Catalan actor Octavi Pujades.