Considering that Catholism doesn't even allow the use of condoms within marriage, I'm going to assume you shouldn't be having oral sex out of marriage.

With Sex and Religion, Im a non-denominational Christian. I have sex, I don't particularly think I should, but I've got a bit laxed on this topic in recent years. Before I was a total right-wing Baptist, waiting till marriage. From what I understood the reason of waiting was, suggests to me that all sexual acts, including oral sex, were to be refrained from.

I don't think God's going to hate you, but I would remain abstinent till you decide where you stand on the topic.