Hello and welcome to HCM.
As an
Urologist, i can fully understand and share your concern.
Let me clarify,there's no testicular 'tubes', causing your discomfort.
Masturbation isn't the cause for your discomfort either.
Taking Ibuprofen randomly is a risky habit,to be stopped at once,as it can damage your kidneys.Exercising,
meditation or yoga, help many people.
You should see an Urologist, and get examined. A scrotal
ultrasound doppler scan, to confirm,there's no problem,in the testis, may be advisable.
Sexual arousal in men, is a normal observation. If you've any doubts,you may send it as a direct question to me.
Dr.Matthew J. Mangat.