Where do whores go?

Not a personal quest for information on this point -- merely a question Tyrion Lannister asks in a preview chapter of the next book in the ASOIAF saga, A Dance with Dragons (a volume which still seems as fabled as any of those Archmaester Marwyn writes about in the Book of Lost Books). But it brings to mind a question I've only recently encountered a moderately plausible-sounding theory in answer to:

Have we seen Tysha onstage yet?

( Very spoilery for ASOIAF if you haven't read it. Comments invited if you have )