Well, it definitely seems to be the preferred tickling genre, since that is what most tickle vid producers tend to dedicate most of their focus to. As a guy, I like f/f. It really isn't my favorite. But I do see some f/f stuff that I really like every now and then. In a way, I feel sort of hypocritical for having a taste in the stuff, because I don't care for m/m much at all.
I think a lot of guys like it because (1) most guys are 'lers---or are switches who lean more towards being 'lers---and prefer tickling women. Therefore, when watching a f/f video, they can fantasize about tickling both the 'lee and the 'ler. They also probably like it because (2) they can admire the attractiveness of both the 'lee and the 'ler.
For myself, when I watch f/f, it is because I am a switch who leans more toward being a 'lee, and would prefer to engage in tickling with a female. So, it gives me a chance to watch a female tickler in action, which I like.
However, if given the chance, I'll take a good f/m video over a f/f video of equal quality almost any day.
