Prisoner found guilty of masturbating in his cell

From The Guardian:

"It is a verdict likely to cause great consternation to lonely prisoners throughout the US penal system. A prisoner in Florida has been found guilty of indecent exposure for masturbating alone in his cell.

Terry Lee Alexander, 20, of Lauderdale Lakes, Florida, was sentenced to a further 60 days in jail on top of the 10-year term he is currently serving for armed robbery, the Miami Herald reported yesterday."

It's worth reading the rest of the story and asking yourself if there aren't better ways to spend taxpayers' money and if forbidding indecent exposure in an 'open' cell that is being actively watched by a female prison officer isn't asking too much.

But for me the funniest part is this:

"Ms McHugh (the defendant's lawyer) asked the 17 prospective jurors who among them had never masturbated. No hands went up."

Why? What were they doing?