Fingering is a big turn on for me (fingering the girl that is as I've not had the pleasure myself ) So far none have objected and judging by the wetness and response do seem to enjoy it. I do actually try to keep my nails short and smooth, which I'm sure helps. Finger licking good really
About the same for me, it has been refused but then that wasn't the only thing with the Pro$$ies involved, certainly not had any problem for at least last 2 years at least.
Cutting and filing nails (all 10 digits, as any may be used) is one of the pre-punt rituals for me. Take some emery boards with you.
Actually, I'd even go as far to say it's been welcomed by most of the girls. Saw one tail end of last year several times, has a great pussy just like Violet Monroe (pussy roadkill thread) so I was downsatirs for ages and I'd give a lot of head and then leave a finger or thumb nearby and she's actively engage it if you know what I mean, wanting more as things progressed.
Generally, don't try it until she has been suitably turned on.
Adultwork should add it as an 'Enjoy'.