Being able to identify a lover's voice without any hints is a pretty cool thing, but it's even better when you can communicate with each other without saying a word (like the exchanging of knowing glances and grunting or making other noises to express oneself while the other understands. For me, I grr a lot and kind of squeak when I'm surprised; my sister, I found, similarly says meep when she's unhappy with something. Communications between couples can be interesting.)
