I don't necessarily agree that entering into a monogamous relationship is 100% safe, unlike masturbation or celibacy, which are 100% sexually safe. Monogamy is taken on faith. You have to trust that your partner stays monogamous. Not everyone does. Many many people cheat--that's a fact and we all know it. And cheating occurs in relationships where people think there is no cheating. So if you chuck condoms and your partner cheats and picks up something, you might get it. So you're not 100% safe, you're living with calculated risks. You take the chance that your partner is honest. I know plenty of people who have become HIV poz because they believed they were in monogamous relationships and their partner lied.

So all you've done is accept the risk, minimize the chance of something going wrong and hope that it all works out well. The OP accepted the risk, choose oral sex without a condom to intercourse without a condom and hopes that his pee doesn't burn. Despite what you wrote, he's 18, legally an adult and he made an adult decision and he will live with the consequences. Just like billions of adults.

If you really think monogamy makes you immune to the potential of stds then you're as naive as you're claiming we are for believe that oral sex without a condom is a safer sex than intercourse without a condom. You want immunity, masturbate or don't have sex with anyone ever. That seems to work well for priests, oh wait...