Well, to be honest, people suck so bad at reading body language. Once you get a small hang of it, it's easy as pie to see who is and who is not interested in you. And then all it takes is to gather up some courage and talk to the person.
I wouldn't give out such cards. It may give the girl a bad impression that you are a ladies man. Because that's what having a nicely-printed pick up cards looks like.
It'd be less conspicuous if you'd have cards stylised to be business cards and say something along the lines "I just might one.... *seemingly random searching your pockets* ... aaah, there it is! Here's my number if you are interested". Discreet and still smooth. Having business cards also makes you seem like a guy with initiative, who does something and is probably social. Source: That's what I'd think about such guy.
I have business cards that have my job listed as "Antagonist." I usually tell chicks not to worry, it's just professionally, off the clock I can be a pretty nice guy.
I'm so good at reading body language, I know what everyone I know's opinion of me is. They all hate me. Actually, I inferred that from their normal language, and not body language.
> twig bitch
> spend daddies money on these cards
> pass out to every guy
> week later no calls/texts
> realize no one wanted to date her anyway
> calls every guy she see's misogynistic pigs only wanting sex
> patriarchy ****
Person A hands the card to person B. The card says B is not interested in dating A, if the card is wrong and person B does like person A then person A's number is on the card.