My boyfriend and I have been in a relationship for about 7 months and neither one of us has ever done anything sexual with anyone else but each other, and I am absolutely positive in that statement. I am thinking about performing unprotected oral sex on him, however, I am very concerned about STDs. I'm afraid if it is possible that his mother had contracted something and chosen not to get tested for STDs during her pregnancy, and passed something onto him, and he has no idea? Would he know after 16 years that he had something, because I heard it is possible to never develop symptoms? Should I be concerned about STDs?