My father watch Help , anything wrong?

Ok , i found out tat my father watch , and he doesn't know how to delete the history , he seldom watch last time , but recently , this few days , whenever he has chance to use the comp , he close the door and watch , ok , i understand tat everymen watch , I too watch , almost everyday , but is it normal for a 50 yrold male?Yes , my parents stop long time ago , i am sure , they dont even sleep together because my mum love air cond , but my father does'nt , ntg seems wrong and our relationship is superbly good. wad does it mean? normal? i dont know y he has been watching so much like me recently? wad happen? stress? , Shud i tell my mum? the only 1 who knows my father watch porn is my brother other than me ? so wad shud I do , and in this kind of situation? wads happening?