I googled it and this is what the first link said. (http://finallyfeminism101.wordpress.com/2008/01/22/feed-the-faq-rape-apologist-definitions-clarifications-and-links/)

But I would summarize it as "WON'T YOU PLEASE THINK OF THE POOR MENS?" Or just "the poor rapist" since female rapists are pardoned all the time because ~lol a woman can't rape anyone.