LOS ANGELES (AP) - A popular dating app is telling a Los Angeles-based AIDS health care group to take down a billboard that links dating apps with sexual diseases.

The AIDS Healthcare Foundation said Monday that it received a cease-and-desist letter from Tinder that claims the billboard falsely associates the dating app with venereal diseases.

The foundation's billboard shows a silhouette of a man labeled "Tinder" face-to-face with a woman labeled "chlamydia." A silhouette of a man labeled "Grindr," a gay dating app, faces a male silhouette labeled "gonorrhea."

The foundation says it sent a letter to Tinder saying it will not take down the billboard.

The foundation provides health care to HIV and AIDS patients and says its campaign is designed to remind dating-app users about the risk of casual sex.