I'd never heard this term since MN (I have name changed for this thread but am a regular). I have a male friend that I worked with 9 years ago. After work we would go out for drinks, sometimes dinner, and back to his for more drinks. There is definitely a spark between us, and we decided very early on that we would have a "no touching" rule, which we have absolutely stuck to.
After a year of working together, he moved on to the far east. We met up when he was back in Europe for lunch (mainly) in Paris, Brussels, Lille, London - easy destinations for me. This went on for several years, then we both ended up in London working in the same street (bizarrely). We met up every day for lunch, coffee or both. I have now moved on. We email constantly every day (as we always have) and have gone back to meeting up for lunch/dinner in Europe. DH knows about this friendship, and while not entirely happy about it, accepts it, but I don't think he realises the extent of the contact. My male friend was in a long distance relationship for some time- he moved to the far east to join her but it didn't work out (he didn't think it would before he left).
We speak on the phone most weeks (for 1-2 hours at a stretch) and are meeting up for dinner in London in a few weeks when we are both there. Had we shagged early on and got it out of our systems, I'm not entirely sure we would be at this stage 9 years on. So has our "self control" led to this relationship carrying on for as long as it has?