I would have thought the answer is obvious, but if one person asks me a question, I have to assume others have the same question and so I’m going to answer yours. Since women perform oral sex on men without any harm, it would be perfectly safe for you to ingest some of your own ejaculate in this manner. In fact, oral sex is a means of transmission of sexually transmitted diseases, but you can’t infect yourself with a disease you might already have. Of course if your wife has a disease, that would be a different story but you’re asking about any potential dangers of ingesting your own ejaculate and there are none.