Is it possible for a sexual encounter which is dry and vigorous to irritate your urethra and lead to chronic prostatitis? That’s the only conclusion I can gather. 

A few years back I had a brief unprotected sexual encounter with a girl, the sex was dry and vigorous. The next day when I woke up I had bruises on my penis shaft which I still have, and had this constant urge to urinate every 30 seconds but was only urinating in small amounts. Within a week of that I experienced lower back pain, burning penile head and a slight discharge from my urethra on 2-3 occasions.(once white once clear). Was convinced std but was scared to get checked because young. Girl told me she was clean, continued sex with her. After a few months only symptom persisting was burning penis head. Decided to get checked for stds. Negative twice (swab and urine.) also had a urinalysis done which came back totally normal. Symptoms seemed to go away completely so I moved on with my life. Here I am now few years later and burning penis head has began coming and going again as well as frequent urination. The burning penis head seems to be worse anytime after drinking alcohol in excess or using substances. Ejaculating always seems to relieve the burning penis head. Haven’t had discharge in years. Can All the signs im reading seem  to point to “chronic prostatitis” I’ve read anecdotes online from people who’s symptoms match up with mine. Is it possible that the dry vigorous sexual encounter did damage to my urethra  and inflamed my prostrate  then  caused all these symptoms afterwards and is still causing symptoms to this day? I’ve had numerous sexual encounters with girlfriends since then and none have developed sti symptoms. Is it safe to say this is something related to damage because of that encounter ? Can inflammation to your urethra/prostrate cause slight discharge in the absence of bacteria infection?

There is no realistic possibility that any STD explains your current symptoms. There simply are no STDs that could cause the things you describe. I'm also skeptical about prostatitis. In any case, the answer to your core question is no:  poorly lubricated or vigorous sex is not likely to irritate the urethra or to cause later prostatitis. Urgent or frequent urinating are not STD symptoms, and neither is low back pain. "Slight discharge" is a bit suggestive of an STD back then, but no STD is likely to cause just 2-3 occasions or clear discharge.

I don't quite know what to make of "bruises" on your penile shaft that have persisted for years. No bruise can last so long. If the sex was so vigorous that bruising actually occurred, I suppose it is possible it could result in some slight discoloration persisting for years, but I doubt it.

You don't mention medical evaluation of your symptoms. Have you not seen a doctor about them after all this time? That would obviously make sense -- ideally a urologist. From all you say, I'm pretty confident nothing serious is going on and I doubt prostatitis. But professional evaluation is the only way to know with certainty. A comprehensive evaluation might include STD testing just for completeness, but I would expect negative results for any and all STD.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD

After my 2 Sti tests and  urinalysis were negative I just kind of decided to live with the symptoms, most of the time I couldn’t even notice them and when they did appear it was so mild I barely EVEN noticed, and the only remaining symptom was a burning Penile head which would always go away after ejaculation. Don’t you think it’s odd that not even 24 hours after a brief unprotected rough vigorous exposure all of a sudden I have this persistent urge to pee and yet could only pee minuscule amounts every 2 minutes. Prior to the sex I’ve never had such a problem. I’ve read online that vigorous sex can irritate the urethra and thus cause inflammation of the prostate. The symptoms like I said only seem  to ever get really bad after a night of heavy drinking(apparently alcohol is a bad trigger for flare ups)  or if I’m taking painkillers for a while (a habit) and cease taking them en completely. Everything I’ve read seems to point to “chronic Prostatitis”. I also sometimes feel a dull ache in my testicles with the burning penis head  which is always relieved by ejaculation. Does this just sound like CP or some other kind of inflammation?

"I’ve read online that vigorous sex can irritate the urethra and thus cause inflammation of the prostate." I am unaware of any scientific evidence for such a thing. Anybody can write anything they want on the web. I suggest you entirely stop searching for answers to all this online; or at least limit yourself to professional or professionally moderated sites. For sure avoid sites by and for people with the same kinds of problem you have:  personal testimony is overwhelmingly inaccurate: best to ignore it entirely.

It is wrong that bacterial infection is th only cause of urethral discharge. And you are exactly right about my judgement about stress and anxiety in many persons on this forum. I'll also add that whenever someone suspects this is the origin of his or her own symptoms, usually s/he is right!

As I said above, I disagree that your symptoms in fact point to prostatitis. But I also said that seeing a urologist makes sense. You simply are never going to have useful answers to these concerns otherwise. Just do it.