Just wanted to say that I find semen disgusting too. I always have. Nothing from my childhood triggered it. I don't even want to see it, let alone touch it. And tasting it is the absolute worst. That's why I don't like giving oral sex (although I could handle it with a condom or if he didn't come in my mouth).
I guess part of it may be that I am a woman and didn't start having sex until late in life (I was 27 my first time). So I never really became familiar with a man's body and how it works. Also I am bisexual and honestly think I would prefer sex with a woman (although I can't find a woman who's interested in me. It's mostly straight men who have no clue about a woman's body).
At any rate, I ended up with a guy who likes to give oral sex, but doesn't care to receive it or have intercourse (which is very unusual). I think he's impotent, although he has told me he isn't. Whatever the case may be, it works well for both of us.