I agree that it is important not to label too much. Maybe I should have made it more clear: And I am not and never was keen on any Kundalini-related experience to be honest I never tried it. It was a kind of 'accident' happening when I induced my first out-of-body experience (as said, not knowing about Kundalini then) and I did not expect this.
Actually this is even quite funny from todays viewpoint, because back then first I mistook it for the famous AP vibrations and later on in forums I read other descriptions of projectors stating that the vibrations were so nice and agreeable. I thought these people were out of their minds.
I never wanted this to be repeated.
Only later I had vibrations myself during the onset of OBE/AP and knew they were sth completely different. I can give a longer description of what I experienced as a 'symptom' at a later time.
In short: It just matched the descriptions of one symptom of Kundalini (belief) which is the 'violent' snake moving along the spine, up your torso, very 'disruptive', 1-2 seconds for each electic thrust. I had it in sleep paralysis state while inducing out-of-body experience, for a whole minute or so, two times.
Once you had this, you never forget it. And (regarding sexuality...) the movement it also felt a bit orgasmic - but without the fun. I even compared my torso then to a kind of ejaculating penis.
And later I also read this in a book whose female author I have forgotten (need to look it up) and she describes the exact same sensation / symptom happening to her. Then other descriptions also matched it, or at least in part.
I do not mind if I can label it Kundalini and/or match it to any Eastern belief system, but it showed to me back then that some of this 'energetic' heavy stuff you can experience is real and that others had it too. And that the energy bodies and chakras might be very real (although they might be belief systems too). Maybe it was not "kundalini" as such (that's why I only said it's a 'symptom') but the opening of the chakras for the first time in order to project, maybe with help of my guides. I had not started yet at that time with any kind of energy work. I had only read one book on it (Bill Buhlman) and tried the method.
If it was a chakra column opening or initation it was a very 'heavy' opening I can tell.
Or maybe a kind of initiation to show me sth - that is what Tom Campbell talks about, all kind of energetic experiences can happen then. As said above, it was also related to my first and only RTZ-projection ('etheric') where I saw my self 'for real' from the outside lying in bed (later exits were always into the Astral planes).
There's more strange obervations to this experience. Maybe this now leads too much off-topic here. I will make a thread on it soon in our AP/OBE board to describe it better.