This is a tricky thing. I enjoy it outside my mouth and shooting onto my tongue because then I taste more of it versus if he shoots deep into my mouth. But Some guys can't shoot and it dribbles out and I can't always catch it on my tongue which isn't as fun.
Yes, being an exhibitionist is fun. Knowing someone is watching me while having sex or just catching a glimpse up my skirt is a recipe for a dripping wet pussy.
Letting guys cum in me is very erotic and gets me even more wet. I have not desire for a guy to eat his cum out of me, but letting another girl eat cum out of me and sharing with me is awesome.
Sucking cock is super fun. My pussy gets so wet when I know I'm giving my lover pleasure. Knowing that I made him cum with my mouth sends me over the edge.