New York City officials warned people today to avoid a toad venom-based aphrodisiac that recently killed a man, the AP reports. The illegal love drug, often sold as Jamaican Stone or Chinese Rock, is harmful whether ingested or applied to the skin. "There is no definitely safe way to use it,” one official said. Similar drugs have killed at least five New Yorkers since the early 1990s. (More aphrodisiacs stories.)