Most Helpful Guy
It doesn't matter who brings up the topic, man or woman. I would wait until the third date or until you think sex would be on the table, its ok to ask if the other person is seeing anyone else earlier, but leave it at that. As for being exclusive, I personally always at least bring it up, even if no "labels" are involved the matter of exclusivity is a deal breaker for me.
I used to just assume that after a while you were just official, like after you started introducing yourselves as bf/gf, but one of my exes cheated on me, and gave the lame excuse "We never said we were exclusive." (isn't that what bf/gf are?)
Anyway ever since then I have always made it official either with a label or at least with exclusivity.