There is serious concern amongst sexual health experts about the rise in cases of genital warts; affecting the genitalia of both sexes they can even infect the anus. These are transmitted by sexual intercourse, including orally, and are caused by a virus known as HPV (human papillomavirus). Genital warts are difficult to prevent even using safe sex techniques and it is quite probably that person who has them may be completely innocent as it is n...