Well shit then, let me toss my preferences out here too. I like seeing finger fucking scenes..it's especially hot to me when the male talent can't seem to keep his hands off or out of her pussy.
I would really like to see more fingering scenes in Gag Factor series. Theres a scene in GF 5 when the bearded guy(don't know his name) is rubbing Mocha's clit and after a few seconds she slaps his hand away..that got me off.