I can't respond to your other comment bc snooggums is banned from my instance

It’s one of those things that works in movies because it’s something you can get away with if you’re incredibly attractive. There’s a whole stock images category involving girls licking their fingers, mostly in a seductive style. But, in the real world, it’s something you do with your husband or long-term partner, not a random cow-orker.

I think this is what people aren't understanding. Someone who does this repeatedly surely must have learned that it's okay/works from a history of doing it, so they're probably very attractive. I'm pretty confident that most normies would react much more playfully/positively than the responses in the comments here if an incredibly attractive person did this to them. If the goal is to swap spit anyway, you're not gonna be thinking about the germs on their fingers