The virus spreads rapidly, but its effects are not noticed by individuals to begin with, and when discovered, the change in sexual attitudes is not recognized as something induced into the body from an outside source. When an FBI investigator finally does suspect that something unusual is going on, the Center for Disease Control is contacted and brought into the investigation. It is quickly discovered that indeed a virus capable of changing sexual attitudes is spreading over the world. While the FBI and CDC are racing to discover the originators of the virus and to create a cure or vaccine, the investigation is hampered by the fact that the agents themselves are becoming infected. The men and women trying desperately to stop the sex virus have to cope with their own changed attitudes and hope the virus can be stopped before society is irrevocably changed. And it may already be too late.