Abstract: An anti-rape device having a hollow housing adapted to be worn within a human vagina. The housing has a front opening and contains a hypodermic syringe having a volume of rape-deterring fluid and a needle facing and aligned with the front opening. Actuator means in the housing are provided which include housing means such as a spring to force the needle through the front opening and inject the fluid, cocking means to cock the device into a position which totally shields the needle within the housing, and prevents action of the spring, and trigger means which automatically releases the cocking means, upon forceful penis penetration of a vagina containing the device, to permit the spring to protrude the needle and inject the fluid into the penis. Preferably, the fluid is a quick-acting, safe narcotic such as scopolamine, or the like to render the rapist unconscious.