Can you get any type of disease from having oral sex without a condom or mouth guard? My friend told me that she gave oral sex for the first time and the guy that she gave it to didn t wear a condom and she didn t have any mouth guard/dental dam...She kept saying how it was safe and she wasn t going to get anything because he didn t ejaculate in her mouth [I know vulgar...Sorry! I ve known the guy for a long time and he is a manwhore and has slept with lots of girls she knows this as well] But I think In fact I m almost positive that isn t true. Am I right? If so what kind of diseases can she get? I tried to tell her but she s hard headed and thinks she s always right! [I KNOW this is in the P S section but the STD section is deserted...No one will answer]