It means none of us are alone. It means that we get to feel this odd kink, one some of us have struggled with and been shamed for either by others or ourselves, gets to be not so odd for a moment. It means no matter what, there is someone who gets it, whether it's kink related or just a bad day. It means not having to figure out everything yourself and being able to share what you've learned. It's acceptance, and kindness, and an odd sort of pseudo-extended family among the friends you make.