In his new book, “On Being Raped,” Raymond M. Douglas, a professor of history at Colgate University, writes publicly for the first time about male rape and being brutally beaten and raped at the age of 18 by a familiar parish priest. The assault, in his native country in Europe, transformed and shaped his life. More than 30 years later, the trauma of the four-hour-long assault continues to have repercussions, and Dr. Douglas argues persuasively that rape is an experience that one can never really relegate to one’s past. Rape, he says, “is always now.”