nipple suck/lick with massage parlour grl

[NomiNomi]

Hi everyone,
1- Is sucking a woman 's nipple by a man is considered oral sex?
2- Should I test, If I suck (no fluid as far as I remembered) for very small interactions (3-4 times consisting of 5-10 sec) for any std/hiv? (the nipples seems to be al-right, I mean no piercing/crack)

when a std can transfer by sucking nipples?

P.s.
Massage parlour girl, serving multiple customer before serving me. Some other customer might have sex on her boobs before she came.
Thank you

[Teak]

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[NomiNomi]

Thanks,

I asked this in the professional forum and answer is the same.
I am just confused over the statement "This is not a sexual activity and, more importantly, HIV is not spread among adults in this way.  " (Edward W Hook, MD)?