I've been in a couple of relationships where we nearly always came together. As you say, a lot of it is about the quality of the intimacy you have developed--the trust and secret knowledge. I think the rest is the sensitivity you develop to one another's bodies, not just recognizing little tells (like you holding your breath) but an unconscious awareness of the level of excitement. To me it felt like being plugged in to each other's nervous system, so that her impending climax triggered mine.

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