what little i know
I know nothing about bananas and women's prisons, but in a class I was taking during spring 2006 a group of students did a project on the reference materials that should be included in a library in a women's prison. They used as a model a women's prison here in the in the Late Great Garden State (New Jersey, USA) and after great difficulty (including background checks by the department of corrections), they actually got to talk by phone to the prison librarian.
As is well known, fruit is almost always prohibited in libraries, prison or not. But in NJ prisons hardcover books are prohibited, because the Man is afraid they would be used as weapons.
I go with the theory that someone will figure out how to make a banana into a weapon. And since women are probably smarter than men, they will figure it out more quickly. And that's why the bananas are forbidden in women's prisons.
It's logical, no?