Second time i’m crossing the path of this ref now … I remember, here :
On “clean” specimens, this answer of RG is making a wide and wild generality. I can turn this in another way, and in being 100% honest in bonus : for me a clean perfect female is a female that can’t be reversed ^^ Is it an useful information, absolutely not.
For your evasive question, i think that the best answer is the one of HolyAngel and not the one of RG.