It has been beautifully described as like waiting for the plumber..."You stay in all day and nobody comes." This is a reference to the fact that making the encounter last and last, without necessarily reaching the normally-expected conclusion, is a key element.
Don't blame me for the fact that someone asked the wretched thing for a sixth time! Presumably the current questioner did not see the earlier versions, so it'll be new to her. I can assure you that I shall post the same answer if it appears for a seventh, eighth or more times. All you've got to do, Comloulou, is ignore it...or, of course, provide an alternative response that might itself be amusing five times.
Qmonster is god and what he says is true but i realise that it's a process of bringing up kundalini through the chakras to a state of nirvana through denial of orgasm.. unless you know differently(ly).. :--)