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It's usually a case of either retrograde ejacualtion where some the semen goes backwards, even if some comes out though usually very little or none is expelled from the urethra.
This can happen from the surgery alone but also can happen from an enlarged prostate.
Did it get worse after you had the TUR? I know you said you don't feel the ejaculation, how about the orgasm, do you have any feeling with the orgasm?
If your prostate isn't an issue but you aren't able to have an orgasm I would wonder if there are any other supplements or medications you are taking that could be causing this?
Testosterone may not be the solution but definitely important to have it checked. Testosterone deficiency usually creates problems with erections.
How long did you say this has been going on for? Has it gradually worsened?
I guess I should clarify, usually a low testosterone affects your libido but it sounds like your libido is there. The erection not doing well even with sildenafil could certainly be a sign that the testosterone is low.
Other things I would have checked is vit D levels, iron levels, ferritin, TSH. Your doctor should be able to order all those tests.
I have had patients in my practice who have had a short period of time when they have experience the inability to have an ejaculation or orgasm. This often has been a temporary issue, I recall most of them having it resolve within a few months but I do recall a couple of men who had it last for nearly a year. One I didn't follow up with but the other did say that it was due to his mood, stress and anxiety. Though he was on other medications as well, I'm not sure but he recovered 100%.