Who Did It (and What in God's Name was Wrong with Them)?
In Ancient Greece and Ancient Rome, the last thing a slave owner wanted was to have his slaves fornicating and masturbating when they could be out picking grapes or being killed by lions for entertainment. Thanks to infibulations their penises were rendered useless as it kept them from even thinking about sex since just getting a semi chub would have hurt like hell.
The practice branched beyond the slave trade towards the fine arts as well. Greeks and Romans enjoyed their live shows but hated big, floppy cock head. This was an issue since most public performances were done in the nude. The solution? Rather than something sensible like tiny hats or a fig leaf; musicians, athletes and comedians opted to do the least logical thing possible and infibulated themselves. Thus the head was obscured allowing for the modesty of these ancient cultures to not be tarnished as they made their way to the state-run orgy.
A tradition that lives on today.
Then in the 1870s, masturbation became a popular scapegoat for most forms of physical and mental anguish such as insanity and epilepsy--which makes sense if you think about all the times you jerk yourself into a fit of seizures. A Welsh physician named David Yellowlees thought he would set up shop as a male infibulator in an effort to stop these masturbators.