On Sunday I got my hair cut and my hairdresser took a card as well.
The fun thing is that all I'm doing is talking. Pretty much everyone asks within the first 5 minutes of meeting someone "what do you do" and when I say "erotic author" usually it inspires some sort of further conversation, usually akin to "wow that sounds like so much fun!" and it being treated like I said "stunt double" or "movie star". Some want the facts on how I got published, some want to know about inspiration, and some want to "talk shop." Pretty much everyone that goes into a positive conversation at some point asks my pen name, when I offer them a card they're thrilled.
So I guess long story short I'm saying talk to strangers, treat that kid at the door begging to sell you a vacuum (or at least demonstrate it!) with courtesy and answer truthfully when they ask you what you do. And get business cards to back you up!