When I wore a wedding ring, women would think: "Taken. Why is this asshole flirting with me?" or, "Yeah, sure he's not cheating," or, "Ooh, he's cheating. Should be good for a one-nighter."
Very few women I have met while out and about have actually accepted/believed that I was in an open relationship. It was especially hard when it was DADT on her end.
I think that's pretty common. When Hubby and I opened the marriage, and he was trying to meet someone for a fuck-buddy or FWB arrangement, a few of the women I was friendly with told me that even though they were interested in him, and even though I told them to their faces that I was okay with him hooking up with someone, they wouldn't touch him because he was married. That, plus the negative experiences with "Betty" (the one woman he did hook up with; I won't get into the negatives) was why he gave up looking for anyone after only a couple of months.
Back to the original topic... I haven't got a bloody clue how to flirt. Apparently, despite that, I'm fairly good at it when I'm comfortable with someone; at least that's what several guys have told me. But I don't know what I do that makes them say that.