According to the mainstream media, there is now a "100% effective" vaccine against the two strains of the human papilloma virus (HPV) that causes most cases of cervical cancer. It is not quite that simple. Some morally conservative parents together with Christian and right-wing pressure groups are suggesting than an HPV vaccine would promote teenage sexual promiscuity. It's an argument which wins no favor with Dr Jack Sobel, a professor of medicine and chief of infectious diseases at Wayne State University School of Medicine in Detroit . He recently told Medscape: "It is beyond belief that there has been public opposition to, and protesting against, a vaccine that will save lives. The concern of increased promiscuity is incomprehensible."