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Thanks for writing.
If you both have HSV-1, then you cannot pass it to each other.
Once a person has been exposed to HSV-1, their body will create “antibodies” for HSV-1, which will protect that person from getting it again.
So, since you are your partner both have the same strain, you are protected from getting it/giving it.
In short: you will not trigger an outbreak, and there is no reason to think you can pass HSV-1 between each other. He can give you oral without worrying about passing HSV-1 to you, or getting HSV-1 from you! We wouldn't recommend worrying about this or having to "look out for" anything!
Hope this helps. Please feel free to submit another question if needed.
This answer was posted on April 30, 2018