I think a few things are getting mixed up here.
Diapers and the testicle: The testicle likes it cold. The higher the temperature there, the less sperm is produced. A diaper can contribute to the warming - as a result there could be problems with family planning.
Diapers and difficulty urinating: It can happen that the penis lies awkwardly and possibly the urethra is somewhat bent. The same can happen if you still have a foreskin. Whether this then leads to a reflux problem depends on the circumstances. If the ureter is normally open, this is very unlikely.
But if you have a prostate enlargement or a urethral obstruction or a neurogenic bladder disorder, you might have to be more careful. Here it depends on whether the bladder disorder is based on a high pressure or a low pressure detrusor. In the case of a high-pressure system, high pressures can occur in the bladder, which may increase if it cannot get out. How ever - here the diaper is mostly the lesser problem, because the harmful pressure builds up there either by a detrusor sphincter dysynergy or just by the drainage obstacle in the urethra.
This is one of the reasons why a urodynamic examination is performed. If the pressure measured is too high, a micturition cysturethrography and reflux cystography are usually performed, which can then be used to identify the problem very precisely.
If reflux is detected, this is usually a reason for a catheter - until the problem has been solved surgically (if possible).
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