As a participant and spectator my first choices are M/F and F/F, respectively. But when I'm watching, between F/M and M/F I prefer the former. Thanks for telling us about this web site; there is something so indescribably hot about female ticklers, I prefer seeing a woman tickle a man even more than the reverse.
The girls in these femdomtickling titles send my heart to the sky:
I am Going to Poke a Hole in Your Side if You Don’t Stop Squirming