@Leadfoot,
I haven't tried the P 0 session. As I understand, it has no set program; everytime it's different. One of my favorites now is P 02; it keeps me energized. If you try it keep your finger on the volume control. Part of it gets so quiet you can't hear, but if you up the volume it sounds like 1000 tiny moths beating their wings in synchrony.
I've had this machine almost 3 months now, and I'm still impressed as it has leveled out my state of mind. I don't use it as much as before, because it's not needed as much, which, I suppose, is a good thing.
Regarding the sex effects, it's not like you're using it and "boing" you have an erection, it somehow just subtlely changes you in the long run, calms you and leaves the body to act and feel naturally. I feel more sexual than I have in a long time, and I'm 73.
I hope you and others keep posting on your experiences and the effects Proteus or any other machine has on you.