I'm sorry you didn't find my response helpful MrBumps, but it was my personal take on the matter. Perhaps it may seem a little bookish to others but I'm someone who likes to know they've really researched and understood something before giving an opinion. I think the definitions are genuinely interesting, and I do think they are relevant to your question - a fetish ceases to be a fetish if it becomes dangerouly all consuming, as it then becomes something else. I think AA's description of a kind of lower level of affinity for something as a kink rather than a full blown fetish is helpful too. That's what I'd say the majority of people have - a kink for spanking, or stockings, or handcuffs, or foodie sex etc etc (or all of the above!) As AA pointed out, true fetishism is actually very very rare.
If I'm really honest, your original post seemed to me, as Miss B said, extremely loaded and that made me feel a little uncomfortable. I wanted to reply to try and set the record straight a little bit, because I didn't like the implication that everyone who enjoyed any kind of bondage was in danger of somehow losing control of their sexual urges and descending into deviancy. You can probably tell from my username that I am someone who enjoys a style of sex that would come under the BDSM umbrella, and I felt that I might be judged if I spelt out too many of the specifics of our sex life on this particular thread, but what I said in my previous post was based on my own experiences with my OH and with all my previous partners over the years, and is very much my own view. That is that enjoying some alternative types of sex play, be that BDSM, swinging, sploshing, or whatever, does not prevent you enjoying "vanilla" sex too.
I think there are two levels of "need" here. My kink is for submission rather than bondage specifically. Although sometimes that involves spanking, cuffs, and other paraphernalia, sometimes it is just about giving myself to my partner completely, and allowing myself to be controlled by his touch, his voice, or even just a look. It's a psychological phenomenon, definitely, rather than being about a specific physical sensation or object fetish. I have an extremely high pressure career where I have to take on a huge amount of decision making responsibility, and I don't think you need to be Freud to see that it has something to do with escapism from that.
I would say that, at the moment, I do need to indulge this kink sometimes in order to feel completely happy and at ease. However, I doubt I will always feel like that, and crucially I absolutely do not need to experience it every time we have sex. In fact, I can positively say I would hate that. Sometimes our sex is sleepy and gentle, sometimes giggly and silly, sometimes it's an urgent lunchtime quicke, sometimes a tipsy fumble, sometimes he initiates it, sometimes I do... I would actually say I need all of these types of sex, as well as our occasional kinkier sessions. They're all part of our relationship and our lives together that I would be really really sad to go without.
I'm not sure if I've given you the answers you want - I'm not sure why, but you seem to be looking for a precise tipping point when a kink gets out of control, and I don't think that exists as a quantifiable entity - but I am being very honest and open, as I always am on these forums, so please be gentle.
SS xx