Hi, Sorry I Come With Such An Embarrassing Question, But

Hi, Sorry I come with such an embarrassing question, but I was wondering, is oral sex safe? My wife and I never had sex with other partners or even kissed them. For me she has been the only girl I ever kissed or been on sexual intercourse with, and For her I'm the only guy she has ever been sexually active with. Is it possible to get HPV or any other type of disease/virus from oral sex even though we have never been with anybody else? We have done oral sex with a condom, but we really want to try doing oral sex without one although at one point we did do it. We just want to be really careful and sure that it is not going to harm our health nor the way we look physically. Thank you.