The only person that believed a BJ wasn't sex was Clinton, and that's because he was trying to find a way to lie and say he didn't. Only an idiot would think that oral sex wasn't sex. It's like saying playing baseball is not playing sports.
US teenagers think oral sex isn't real sex
A study of nearly 600 young California teenagers indicates that, having been told to be abstinent and warned of dangers of sex such as pregnancy and sexually transmitted diseases, they have decided that oral sex is the safest choice (Pediatrics 2005;115:845-51).
Previous studies indicated that many young people choose to have oral sex and don't consider it "real sex." In 1999 a study in the journal of the American Medical Association showed that US university students didn't think oral sex was real sex (JAMA 1999:281;275-7).
Publication of that study coincided with the impeachment trial of Bill Clinton, at which he denied sexual relations with Monica Lewinsky, who had performed oral sex on him. Dr George Lundberg, editor of JAMA, was fired for publishing the article (BMJ 1999;318:213).
The authors of the Pediatrics study say that teenagers see oral sex as a way of preserving their virginity while allowing intimacy and sexual pleasure. "A far greater number of adolescents are engaging in oral sex than vaginal sex and at young ages," they write. However, teenagers think oral sex is safer than it is.