Right, just like it's inappropriate for a guy to go up to a random woman, or even a familiar woman in a friendly setting and just say "hey you wanna fuck?" it's also inappropriate in the other direction. That's why you use an escalating series of verbal and non verbal cues to gauge interest first before you commit fully.

Could be, but that's immature and unattractive. You're better off not throwing in with someone who's unwilling to be vulnerable

Yea, I think so.