Background: I am a heterosexual male. I live in the U.S. and attend college currently. I have never had penetrative intercourse, and plan on waiting until marriage. Nonetheless I have had encounters that worry me with respect to STD's. These 3 encounters are my sexual history in chronological order. I know these questions may get asked often but I do appreciate you still taking them seriously. 

Encounter 1: tongue kissing a girl, and she gave me oral sex for about 20-30 seconds and I ejaculated in her mouth. ----Risk / Need for testing?

Encounter 2: tongue kissing a woman, I inserted my fingers to her vagina for about 30 seconds. She Gave me a mildly rough handjob. After the handjob, she climbed on top of me and rubbed her wet vagina on my penis for about 1 minute, no penetration. ----Risk / Need for testing?

Encounter 3: a girl from my calculus class was giving me a handjob, and I ejaculated into her eye. ----Does she need testing?

Thank you sincerely for the amazing work you do. Your expertise is highly valued beyond words.

Welcome to the Forum.  I'll be glad to reply.  These were are relatively low risk events, some no risk, some low but not no risk.  For starters, most people do not have STIs and even when they do, only a minority of exposures lead to infection.   

I'll now comment first on various sexual activities, then on testing.  STIs are transmitted by direct contact with an infectious surface but the risk for transmission varies anatomically with the surface.  Further STI pathogens, including HIV become non-infectious on exposure to the air and environment.  As a result mutual masturbation, even when genital secretions get on each other, there is no risk for infection.  Thus both your receipt of masturbation and masturbation of a partner are NO risk events.  On the other hand, the throat can be infected with gonorrhea or chlamydia. Neither is common but it does occur.  As a result, there is a small risk for acquisition of STI from receipt of oral sex although this risk is low.  In your case, the absence of symptoms now, 5 months after the events makes it quite unlikely that you were infected.  Not all infections cause symptoms however and for that reason, just to be 100% confident that you were not infected, it might be reasonable to be tested fro gonorrhea and chlamydia with a urine test which could be done at your local health department or school student health facility. 

Finally, if it has been five months since you ejaculated on a partner's face and she has had not had trouble, she does not need testing unless and in in the unlikely event that the urine test for gonorrhea and chlamydia that I mentioned above is positive. 

I hope these responses are helpful.  If not, up to two follow-up questions are allowed.  EWH

With regards to encounter 2 that I described - (grinding her wet vagina on my penis for 1-2 minutes (no penetration) ) there is ZERO risk of hiv? What about the *possibility* if the somewhat rough handjob she gave me prior created possible "irritation" or "micro tears" on my penis?

I thought the entire penis was a mucous membrane, including the shaft and head, not just the urethra? Is this true or false? 

If you could explicate a bit more on this particular subject I would truly appreciate it beyond words. 

additionally, is it true or false that hiv in women is found more in the inner/upper-vaginal secretions that in the vaginal secretions around the skin?

Lastly, I always read that hiv dies when it comes in contact with air, but is it instantly or does it take a 1,2,3...n seconds? Is there an exact time frame that is known for this? Like if ejaculte is shot from the penis through the air and goes into a women's eye, would the hypothetical virus be dead in that timeframe?

Thank you so much I will try not to inquire any further, have an excellent day.

As I said earlier, there are no STIs transmitted by masturbation.  "Hand jobs", even rough ones, are not STIs.

Only the urethra (the tube that urine comes out of) is a mucous membrane, not the surface of the penis.

I am not sure what you mean by inner/upper secretions.   When genital secretions leave the body, they are no longer infectious.

No one has timed just how long it takes HIV to die.  On the other hand, after the experience of millions and millions of exposures in which NOT ONE has led to infections, it is safe to assume that your ejaculation into someone's eye did not lead to infection.

Hope this helps.  EWH

The reason I choose to ask a follow up question is because although you mentioned that I do not need hiv testing based on the encounters I described, there is so much conflicting information online about the risk of hiv from a woman grinding her Wet vagina on the outside of a penis. Just curious as to why you think there seems to not be a consensus - despite the conflicting information online I am going to trust you advise and not test. Just wondering what your thoughts are.

Thank you very kindly sir.

The Internet is a great place for much information and communication but not for assessing HIV or STI risk.  I hope my comments help.

As per Forum guideline, since this is my third response, this thread will close later today.  I wish you the best.  Stay safe.  EWH