You said that semen sometimes contains traces of urine, and you also said that you can't contract any illnesses by eating your own semen.

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You said that semen sometimes contains traces of urine, and you also said that you can't contract any illnesses by eating your own semen.

But what about the traces of urine? Won't the urine give you an illness?

You wouldn't want to ingest a significant quantity of urine, but with the amount that may (or may not) be in a single ejaculate of semen – just a trace – it wouldn't be a problem to ingest. Urine is some 98% water anyway, so the amount of undesirable substances from urine that may end up in a couple teaspoons of semen is negligible.