He can get exhaused from overdoing it!
Masturbation doesn't cause severe problems.
NO AS LONG AS THERE ISNT ANY EJACULATION ON YOUR FINGER YOU WILL BE PERFECTLY FiiNE UNLESS YOU HAD UNPROTECTED SEX THEN SOMETHiiNG MiiGHT BE WRONG
alot of ppl say saggy lips cause when you masturbation ALOT.. but im 15 been doin it since i was 10 , and twice a day.. it never happened to me
If you do it too much then a sore winkie! other than that i don't know of any.i don't know