The muse measures the PPG indeed, however, the sensor isn’t accurate enough for science purposes, as you reasoned yourself indeed.
The hypo/hyperarousal is the outcome of that same trade off in that system under different person-specific conditions. In my own sense, _to enter the stage of reproductive sexual responses, one must have a body in which the processes inside are synchronised. The sexual state is a state in which a person’s consciousness is tending to unify all kinds of thoughts rising from sensations (mind&body tend to unify). During trauma mind and body dissociate, so imo, training unification of biophysical rebalancing and accommodating thoughts can re-associate a traumatised person with one self.
Haha, yeah, good luck getting that through an ethics committee xD If you do somehow find an ethical way, please consider having at least three control groups. A baseline of persons w/o trauma, baseline of persons w/ trauma, and a group of persons w/ trauma that imagine orgasms. That way you can compare normal vs trauma, create baseline difference, and then start comparing the brainwaves of traumatised persons full-body genuine orgasmic states with traumatised persons with imagined orgasms and filter out frequencies for sexual responsiveness. As a bonus you can infer to what extent sexual responsiveness is calibrated from the brain, the body or both in your groups. It’s a good start for shaping a form of therapy for sexual responsiveness.
You can also message me as I am working in the same field and we can exchange info!