. . . to do YOUR part to help stamp out what are now called STI's. Funny how as our knowledge of STI's and our ability to treat them has bloomed, our societal level of comfort with such PSAs seems to have withered. I used to see cleverly designed (and carefully/antiseptically couched) PSAs about HIV/AIDS when I lived in DC, but they lacked this poster's attention-grabbing power.
I also like the presence of a "Bureau of Social Hygiene" on there - something about that feels semi-menacing, right?