Your gifs are great!!! I've been thinking about making my own, but I'm worried about copyright laws. Does posting where the gifs come from cover you?
Posting the origin of the gif does not change anything concerning the copyright. I do it as a form of respect of the actresses, and I hope some people will buy videos based on what they see on my blog.
Several actresses have reblogged some gifs of this blog onto their own Tumblr blog. So, I don’t think anyone will attack you for posting gifs.
Anyway, the best you can do to protect yourself concerning copyright laws is to ensure the reader (in the description of your blog for instance) that you will remove any post if you receive such request.