CNN - Sep 15 - This summer, Grindr caught some criticism for asking in a user survey "What is your HIV status?" and "How would you feel if Grindr allowed you to filter the guys you see by HIV status?" "Dating sites shouldn't ask for HIV status, because there's no way to guarantee privacy," said Daniel Reeders, a Ph.D. candidate who studies HIV stigma at Australian National University. Although an HIV filter could have the benefit of letting HIV-positive people meet others, it also could create a false sense of security. A dating app filter could lead HIV-negative people to think that the filtered matches consist of only HIV-negative people. From there, they might engage in unprotected sex.