With gays primarily finding sex partners through gay contact portals on the Internet, the Swiss Federal Office of Public Health sought a way to access such portals directly with its message of prevention.An ad showing a woman was placed in the middle of erotic contact ads for gay men. Curious to find out more, portal visitors klicked the ad to find that the woman partner ad is as much out of place on gay portals as sex without a condom.Target group are gays who constitute the most exposed segment of the population receptive to messages of HIV/AIDS prevention.