i can't speak for all vulva'd people, but... i feel like that's mostly a porn thing.

the amount of times i licked my hand before masturbating: once, to see if it was good. it wasn't (and i find it kind of gross. no offense to ppl who are into it tho). and i masturbate a lot

pre-transition, getting it wet wasn't even that hard. why would i use spit for that lmao. i mean some people might have that issue, right, but i'd still rather just use lube if that were the case

i think it's just supposed to be hot for whatever reason

I always just assumed it's another visual for porn. There is only so much you can look at, so it helps add more for the viewer to think about. It looks hot, but in reality, I would imagine it's rarely done. I have never done it either.

It depends on the situation. As a penis owner, it's very rough without lubrication, but I don't always have access to something. So in those cases, I lick my hand to provide something.

Granted, I have to do it repeatedly otherwise the friction gets worse than using nothing.

What? You guys lick / spit to masturbate? I just use my hand, nothing else.

No, easy enough to start and then just reach inside if you want it slippery.

Some women prefer a slippery clit.

So here's the thing... With cock inside, how else would you get some more moisture there? And it's a lick.