Officials with the U.S. Food and Drug Administration (FDA) are taking action on fake pills and supplements that some companies claim will prevent or cure sexually transmitted diseases such as genital warts, herpes, and HIV. About a dozen companies selling products such as Medavir, C-Cure, and Herpaflor received warning letters from the FDA this week, saying none of the products have been proven to treat any disease and should not be marketed with these claims. FDA officials say these bogus...