STIs, such as gonorrhea, syphilis, chlamydia, and HIV, can be transmitted through contact with bodily fluids, including pre-ejaculatory fluid or ejaculate. Herpes and human papillomavirus (HPV) can also be passed on through oral sex. Although these cases are rare, transmission is possible, and if you don’t want to gamble with your health you could try using an condom or a dental dam during oral …