I come to this discussion somewhat late in the day (having only just joined the forum) but Walter has hit the nail on the head, with his posts about the possible long-term effects of childhood mask-induced anaesthetisation. A very perceptive assessment of a very real situation for some of us, if I may say so (many of us, I suspect). I have long tried to understand it and failed, and I have yet to see a medical definition or professional explanation.  Perhaps it is indeed one for the psychologists, rather than the anaesthetists? So my advice is to make the most of it and enjoy it whilst you can – whatever turns you on. (The kit is readily available on e-bay, after all .....!)