i guess it depends on the situation, some girls mind, some don't... use it with the ones that don't
use it the first time u fuck certain girl, you'll probably have more chances of getting laid with her again in the future
then again, if u pick up a girl at a club or disco and go straight to the bed, use the mofo, most of the girls that do that fuck everyone on their way, i wouldn't put my dick without a condom into a pussy that's been drilled hundreds of times (just think about it), at least not till i know she's clean...
anyway, condoms are not safe, if you're thinking about aids, best way to be 100% safe is fuckin' your own hand, or becoming a pet lover, and as for gettin' em pregnant, there are hundreds of pills pre and post sex (abortive ones), most doctors won't deny u the last one if u ask for it
have fun