Anytime you come into contact with anyone else's fluids, there is a risk of passing on disease/infection, etc. This includes saliva, blood, mucus, etc.
Uncovered oral still does pose a risk, though not as great as uncovered penetration.
You should check out the CDC site or even Planned Parenthood if you would like to educate yourself on the risks involved with each activity.
Engaging in the hobby carries its risks, on several levels.
If one is not prepared to accept those risks as part of the fun, then perhaps it is not the best hobby for you.
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