Ejaculating urine is called climacturea, and it's very common after prostatectomy. It happens because of the loss of the internal urinary sphincter with the prostate. Normally, that clamps shut during ejaculation to prevent semen being lost into the bladder (retrograde ejaculation) and also stops urine leaking out, but it's always removed with the prostate. Men rely on their external urinary sphincter for continence after prostatectomy, and that's forced open during ejaculation, often causing urine leak when there's no internal urinary sphincter anymore.
Urine is just as sterile as semen, so you don't need to worry on that front. The effect might be reduced by making sure he has a pee beforehand, but by the time he gets to orgasm, some fresh urine will have collected. I also haven't heard of anything on the pH side. Any man who's just had a pee before sex is likely to release urine into his partner anyway, so I doubt it's a significant issue.
This comes up when I'm counseling men, and their views on it vary enormously. For some men, it's a cause of embarrassment, whereas for others, the fact they still ejaculate something is a great source of relief and they suspect it makes the orgasms better. Equally, for some men who now have completely dry orgasms, the loss of any ejaculate can be a significant psychological problem. Personally I find it a great convenience, and means I no longer buy Kleenix in bulk from Costco. This just shows a wide range of views. I don't usually get the opportunity to talk with partners about it, so your thoughts on it are useful, and thoroughly understandable. Urine is usually associated with toilets and considered dirty, but it is in fact sterile unless you have an infection, exactly the same for semen. Some foods can impact the smell of urine which can have a strong psychological effect, and you could agree to avoid such foods before sex.
This might happen forever, or it might improve if his continence is still improving. You might find the use of something like a Durex Pleasure ring is enough to prevent it, depending on how much there is, although the ejaculation process is designed to make sure fluid gets out in spite of pressure applied, so that might not work for you/him.
Edited by member 07 Sep 2020 at 15:56
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