Nope, I never ask.
At the end of the day, I'm going to assume that if she's an attractive woman that someone is hanging around her like a bee hangs around pollen. Hell, even if she's not that attractive, she still has a vagina, so some dude is going to be hanging around her. They could be having sex, they could not be...doesn't matter...he's still waiting for his shot.
Since, I'm not competing with that dude, I'm just going to worry about my interaction with the woman and let her choose correctly. Letting a woman choose will alleviate any issue that would come with the "man" thing anyway.
If she has a man that she TRULY cares about, then she won't choose up.
If she doesn't have a man, or the guy she's dating is nothing more than a stop-gap, then she will choose up.
Peace