I am 45-years old. I once 5 yrs ago, had blood in my semen during masturbation. It went away. Now it came back. I suspect that it was due to accidental pinch on one of the nerves in the scrotal sack. I for now decided to slow down on masturbation anyhow, just to see what happens in the next 2 weeks.
Degree understand your concerns went through your details. If you find blood with semen during masturbation or sexual intercourse, I suggest, you should consult a physician. Prostrate related disorders has one symptom such as this. Take care. If you still need my assistance in this regard, please use this link. http