I get great traffic from a few of the teen and amateur niche LL's.
As for my own, thoughts; I, like Greenie, don't care for mixed content on a FS. I prefer to see one model (or group of models), doing one thing (preferably from the same content set). However; I couldn't care less if the first page has softcore (foreplay and teasing) and the second set has the hardcore (fucking) as long as it's the natural progression of the same photo shoot or video.
This is based more on my preferences as a surfer than on my ideas of ideal SEO or niche alignment. FS's with two totally different sets on page 1 and page 2 always throw me off a bit - even if the general niche is the same (let's say teens for the sake of argument).
As I usually lists FS's in three or more cats on my LL, if the first page has a "perky-titted teen outdoors", and the second page has a "huge-titted teen indoors", you just screwed yourself out of getting listed three cats (Outdoors, Perky Tits and Huge Knockers) - cuz I can't bring myself to put FS's with indoor pictures in my outdoor cat.......
go figure....... You're also not doing a very good job of building a FS that targets a specific micro niche.
I thinks it's no secret here that I like amateur teen content - so when surfing, there's a pretty good chance that I'll click on the teen cat of your LL. What you don't know, is I want to see teens with perky little titties and firm round asses. Give me a way to find these teens on the LL, then give me a FS that features them properly, and I'm much more likely to visit the sponsor. Now make sure that the perky-titted teen with the round little ass that was featured on the FS is also on the sponsor's tour, and you just increased your chances of making a sale by a few hundred percent.
So - a good FS with an outdoor hardcore video with an amateur model who has perky little titties and a great ass could get listed in:
Teen, Amateur, Hardcore, Perky Tits, Outdoor, and possible Reality.
The same logic applies on Greenie's Porn Movie Links since he lets you submit in up to three cats. For example; Brunette Hardcore, Shaved Hardcore, and Teen Hardcore. By mixing models and or shoots on a FS - you limit the listing possibilities.