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