There are cases were if your bf carried the hpv virus and you were to perform oral studies have shown it can lead to throat or mouth cancers later in life. It's a recent discovery but don't let it scare you. If you know your partner is clean then there is nothing to worry about. If it worries you and neither of you have been tested for stds then have stds test provided by your doctor or gynocologist. As for oral, some people just don't enjoy giving or reciving or both of those and that is okay. Talk to your bf about this and your sex life. If he is a good partner he won't push you and will understand your boundaries. Take things as you feel comforatable. Sometimes we have to be comfortable with ourselves, our own body, and our sexuality before we can be okay to fully share those things with our partner. It took me a long time to be comfortable with those things and once I was I had an easier time with sex. Wishing you the best.