Today's poll about toothbrushing and walking around came out of a conversation also about levels of "intimacy" of certain actvities, and how differently people can draw those lines. So, for example, I'm always a little amazed when I see someone putting on makeup in public (not a restroom), because it's such a mismatch with my individual, "Hey! That's personal..." scale. I feel similarly about clipping or filing nails: these things are okay to do with friends, but not strangers. On the other hand, I'm happy to brush my hair in public (or my equivalent, anyway, which doesn't involve a brush or comb.)
Then, there are more intimate things, like peeing with someone else in the room (no stalls), or being in the room while someone else is peeing -- I feel fine about doing either with a reasonably close friend or lover, but it's a definite mark of a more "inner circle" relationship. And crying is a VERY inner circle activity for me.
What are some of your relative markers of social intimacy?