The fact remains that women do sometimes make false accusations of rape, and men accused of it are as entitled to the presumption of innocence as anyone else. If an accused man pleads not guilty and puts his accuser through the ordeal of defending her accusation in court, and is eventually found guilty, his not-guilty plea and his insistence on the woman being questioned will be taken into account when he is sentenced, and his jail term will be significantly longer than it would have been if he'd pleaded guilty and spared her some of the ordeal. The presumption of innocence is a vital part of a fair legal system, and should not be undermined.