My parents know. My mom, at least is fine with it. She may not be very clear on what it means, exactly, but she's fine with it.
I have 15 minutes to be hysterical somewhere before I head off to grade undergrad exams.
[update]
Post phone call:
Mom's okay with it though she still kind of thinks of it as a phase. Nevertheless she holds to her opinion of health and happiness first and is very supportive of "experimenting". Dad's not okay and will most likely adapt a model of "never speak of it again". I've asked mom to play along since the last thing I need to give them another thing to fight over.
That went well, all things considered.