"I lead a straight and clean life, and so does my girlfriend. We're faithful and don't take drugs. The scientists say our chances of getting AIDS are slim. I'm not worried.""Mark's right, the chances are slim. But he lost the bet -- he already has AIDS. His girlfriend does lead a safe life today. But in college she played the field. She contracted AIDS and with sex she passed the virus on to him. Using a condom might have saved his life. *""Don't take chances ... use condoms.""*The U.S. Surgeon General states that barring abstinence, the best prevention for AIDS is the use of condoms.""One of a series of ads created by Zuchelli & Johnson Advertising Inc, Seaford, N.Y. 11783-3455, published by Newsday as a public service."