Our expert says:
Apologies for the delay in responding.
I can't give you a percentage I'm afraid, just like she can't be 100% sure that she did't have a small cut in her mouth/gum. Be aware also that a healthy penis does not mean that he is not carrying an STI. We should not be complacent in any circumstance with a partner whose sexual health is unknown. There is a chance that she is ok, that he is not HIV+ and that she did not have even microscopic abrasions. However, there is also a chance that the opposite is true. She could approach her local clinic and ask for advice and testing if appropriate.
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