Our lovely and sexy friend, when faced with this situation, simply waves her wedding band and says, "I'm sorry! I'm very married" :) I like that approach more and more.
It's when my damn people pleasing comes in and bites me in the butt. I just want to be open and honest about myself, and it is really important to me to be a relationship diversity advocate. I just want to tell everyone about it, and just for the sake of spreading awareness. I'm not even looking for a date! But that's the issue. That person is looking for a date. And I need to remember that and take their feelings into consideration before waving my open relationship banner without thinking about the repercussions.
I guess these are nice challenges to face.