She knows it from the beginning. When you watch it she plays around with him while the plant is blowing him. I think she says to him "fuck me" straddles him, graps his dick and fucks him. Clearly she knows it's bareback. The Plant comes back realises it's bareback and stops it.
Have to watch it again when I'm back home but i think she get's fucked bareback one more time.
This guy is infamous for not wearing a condom lol. So many episodes girls point out to him he's not wearing a condom or the staff have to hand him one. In PHGC Vol 9 Gina even gets fed up and starts making fun of him by putting a condom on her microphone and playing around with it right behind him lol.