Given that going down on women who may carry the Human Papillomavirus which gives women cervical cancer and men throat cancer, gum disease is hardly worth losing any sleep over. My mate had throat cancer suspected to have been through contracting HPV from going down on lasses back in his 20s, 30 years ago. He got sorted with just radiotherapy but he's had a loss of smell, taste and now suffers from tinnitus a result of the treatment.