I think it was Shirley Glass who said "you never know if you are crossing the line until you are on the other side of it, and then its too late."
Well, the great Rev. Billy Graham would agree with you. When someone once asked him how he remained scandal-free all of these years, despite other (nearly every?) other person in THAT kind of position of lofty power seems to succomb to the temptations of attractive women practically THROWING themselves at you (not to mention the spiritual enemy seeking to destroy your ministry), Graham said something like:
"It's very simple. I never allowed myself to be alone in my office -- or anywhere else -- with another woman who wasn't my wife, with the door closed."