Hi, Thanks for writing in. Though few studies have indicated the role of oral sex and HPV in tonsil cancer, it is still difficult to prove that your boy friend has cancer of the tonsil from having oral sex with you. It is important for him to consult the ENT specialist and confirm his condition. In most probability it might be due to an infection which has been ignored for sometime and he will be cured if given treatment. Cancer screening requires proper clinical examination and investigations. Cancer might cause lumps in the neck which are lymph node swelling with loss of weight. These are to be discussed with his doctor. Please do not conclude that oral sex has given him the cancer without first confirming it.