I didn't mean "beard" and "essentially got replaced". Several times I observed stable and happy MFF relationships.
Alright, it might be quite a feat to achieve, but firstly, we're talking about AVN, not RL; and 2ndly, moving there could be an interesting part of the story.
(Please excuse me if I don't want to expound here the particular strategy of how to gradually convert a straight monogamous girl to a polyamorous bi...)