The cards include a drop-box menu of eight disease options (chlamydia, molluscum contagiosum, and non-gonorrheal urethritis being three), but do not include HIV. ("the designers feared that spammers might use that attribute to scare people." Sure.) The founders also say they're trying to reduce the shame factor in telling someone you've caught an STD.
Now, SFist doesn't mean to take a negative view about humanity or anything, but it seems like this website might encourage some, ahem, not very funny practical jokes -- especially since you don't have to give them an email address, or you can give them a fake one. (Please promise us you won't do that, by the way.) But hey, anything to help people get treatment is worth a try. Meanwhile, folks, wrap it up every time.