It can be if the me or female has an infection or disease. Make sure you get checked by a doctor if you feel something is wrong. And make sure he/she has nothing wrong with him. You could get majorly sick or worse.
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It shouldn't, if you don't already have one. Some studies say swallowing is linked to throat cancer, but that really concerns your ordinary health habits (i.e., diet, exercise, life style...).
Yes, you can eat sperm but certain diseases such as Herpes can exist only in your reproductive system. They can then be transmitted to the mouth as oral Herpes.