Theoretically it is possible to pee just after ejaculation.
Men in the sexual act, no matter how long, the kidneys will continue to produce urine stored in the bladder, gradually accumulating the desire to urinate, but when the sexual organs are erect, most of the attention is focused on the pleasure of sexual contact, so the desire to urinate will be suppressed until the end of ejaculation, the desire to urinate will naturally reappear, so that people want to go to the toilet feeling.
Men in the erection, the prostate gland will also be in a state of congestion, after ejaculation, the swelling of the prostate gland will not quickly subside, and then press the urethra sprouting the desire to urinate, but the amount of urine is not as usual.
Therefore, it is normal to have a lower urine output than before. Most of the time the prostate gland is in a relaxed state, and there will not be any problems with urination, so there is no need to worry that going to urinate with a swollen prostate after ejaculation will make the bladder weak, or that the urine will flow back into the prostate gland and cause inflammation.
Therefore, it is possible to urinate after ejaculation. Drinking plenty of water and going to the toilet to get rid of any remaining semen is also a more hygienic option.