Thank you for the information,
There are many causes of blood in the urine.
Infection of the kidney or the urinary tract, prostate are the common causes.
Stone in the urinary system may also cause blood with the urine.
Among other causes are clotting disorder, benign prostatic hyperplasia, or any growth of prostate, urinary system, hypertension, diabetes,strenuous exercise etc.
When there is tenderness in the penis, there can be an infection or trauma there.
He needs to do investigation to find out the cause of blood in the urine.
I feel he should consult doctor without delay as the bleeding is much.
I hope this information will be helpful.
Please ask if you need any clarification.