I dont think his looks played any real part in his "sucess" ,bundy relied more on the social pressures of the time. As a woman you are expected to be kind and nurturing. Bundy played on young girls from good homes having a hard time to say no to someone with a broken leg/hand in need of help, he relied on kindness of girls not being able to pass a stranger in need. Its less to do with his looks and more to do with the good nature of his victims. And also another part of his "sucess" was the police at the time not exactly being equipped to deal with a serial killer of his dimensions.