In literal terms perhaps, but not in emotional terms. You can pick up on what a person is and isn't comfortable with, what is and isn't solicited, etc. The tricky thing, for some people, is that these usually aren't spelled out letter by letter. A stranger at a bar and a colleague in your workplace may have very different definitions of acceptable behavior, but the ways they communicate it are going to be more or less the same.

> the same woman may see things differently based on current mood

That seems inaccurate and honestly sexist. But more importantly, as above, the signals will still work the same way, even if the things being signaled change.