Sapphic Erotica is one of the most well known lesbian paysites on the web. Each Sapphic Erotica video is between 15 and 25 minutes long. There are 41 tribadism videos in total, 17 containing just a short trib session and 24 with longer and better tribbing.
LesboTrick doesn't have as many tribadism videos as Sapphic Erotica but they videos they do have contain longer trib sessions using numerous positions.
If you're looking for Tribbing Videos then you'll be glad to hear that Hotmovies has over 400 videos tagged with 'Tribadism' in their database with more being added every day.
The standout leader in the Premium tribbing videos category. Most of the videos start off as some kind of catfight before developing into some aggressive and energetic tribadism in a variety of positions.