That middle one (Abbey Rain) went troon awhile back (lol). Called herself "Robin Hearts," cut her hair short (but not off), made no other changes whatsoever, and declared herself "male" proclaiming that she would be performing as a "male" from then on (after having done dozens of hardcore G/G and B/G scenes as a woman).
Following this bold proclamation, she appeared in a whopping two whole scenes as a "male" (both solo performances -- apparently even male porn stars have limits on what kind of crazy they'll stick their dicks into) before unceremoniously dropping off the face of the earth. Any% career suicide speedrun.
Troons. Not even once.