The semen will be eliminated with the urine if one does not spank the monkey or have sex. Its a personal choice to spank the monkey or not but to believe that the body is self destructive and contains cancer causing substances does not seem credible. Nature is not self destructive and always attempts to survive. Cancer is a result of deeper problems that cannot be eliminated just with the supply lycopene.
I cannot agree that self-gratification is a health producing activity as it often turns into a habit of narrow self indulgence, and, pasting onto it this so called 'benefit',merely attempts to justify it.