Hi Carol, welcome!
Hmmm... free full length BDSM movies may be a bit of an oxymoron in our current economic situation. Due to the high cost of production for sexually explicit content (not just up front, but accounting, representation, etc.) and also the high demand for said content - most anything you would actually want to watch in this genre is going to cost some money.
The only free resources for that type of content that we've seen in recent years have been bootleg versions of copyrighted content.
So, the question is - where can you find that fairly limited amount of good sex / BDSM movie content that's actually worth a few bucks?!?!? :)
Check out
Kink.com, particularly take a look at the different topic areas on the page and go from there, see if you find anything appealing.
Leave a comment below and let us know what you think, and what else you find!
Dan