Normally when I give my business card back, I don't get any calls back from people. I have mainly used my business card to ID myself, it's a quick subtle social proof (ie the card has me with a suit on, it's a professional card, so you don't look like someone off the street esp. if you are not dressed up), but rarely use it now since having my full-time job. I would say that we are still both in a similar boat.
For example, Real-Estate is generally something people look up to because people have assumptions if you are in Real-Estate. That you have money, own your own place, own properties for investment and are renting it out, or are making allot of money. The details, if you are an unsuccessful agent that has parked a license, or otherwise just struggling, is starkly different then what people would assume from the get-go. (However, little cues, like how you are talking about it, or if you are not enthusiatic about it, probably could give that away).
The full-time job is in a decent field too. I'm a licensed insurance agent that deals with Critical Illness insurance that's affiliated with a very big bank. I could say that I am employed at the insurance department of said bank and talk a bit about the insurance. What I would leave out, is the word "call center" and that you are cold calling allot of people. Or the fact the pay is too small for this time and that leads to a very tight budget, assumping you can control your own expenses aggressively. Those aspects make it crappy...but it's in a great field (ie one of the saving graces with it).
But here is the thing, aren't you concerned, that if a woman likes you because you impressed her with your job, that when she finds out the truth of the details then she's gone. I mean you can say you work with NASA, but if she finds out you work as security or custodian there, then again, it would be a far different thing.