Red Ridge (2006) - http://www.cduniverse.com/productinfo.asp?pid=7697357

The Cellar Door (2007) - http://www.amazon.com/Cellar-Door-James-Dumont/dp/B0010AEPJG

13 Hours in a Warehouse (2008) - http://www.amazon.com/13-Hours-Warehouse-Carson-Lee/dp/B001D04ADY

Red Ridge is about a young woman and her boyfriend who run afoul of white slavers in Texas. She ends up spending a lot of time handcuffed to a bed with her mouth taped shut and sexually abused, later another girl is also captured and abused and then hung from a tree. I won't spoil if she lives or not.

The Cellar Door is about a guy who has a woman chained up in his basement. In the first few minutes she escapes and he goes after her. After that mishap he tries something new and makes a cage in his basement to keep the next girl in. The first actress's name is Christina Reynolds. I mention her because her scene is the best mainstream thing I've seen since Natalie Avital in Shallow Ground. Her bondage is really harsh, and she acts her heart out. Damn fine job. The next girl is named Michelle Tomlinson and she has a real wicked sexiness. She is never in bondage, though, just locked in the cage.

13 Hours in a Basement: Notice how many horror movies lately, especially independent ones, have a heist crew and some hostages beset by a supernatural menace of some kind? Here's another one. That said, I really liked the movie. It is well plotted and paced, with a good story that moves along nicely. For us, the hostage is bound and gagged, and one of the ghosts is a young woman in a bit-gag.

A movie that seemed promising but that I didn't really like was The Girl In The Basement (aka Reindeer Games) (1996) - http://www.amazon.com/Girl-Basement-Mary-Skinner/dp/B0009XRZPG. If you're not a gag snob like I am you might like it a little better than I did, it is very low budget about a poor shy guy who knocks out one of his co-workers and cuffs her to a chair in his basement. She is only gagged once, pretty loosely and only for a few seconds, for the curious. She is also a complete bitch. Very little sexual anything, because he just kinda goes down there off and on and she says nasty shit to him and he goes upstairs and mopes.