Really? Then why was it OK when Bill Clinton had sex with an intern?
The price of shame — March 2015
At the age of 22, I fell in love with my boss, and at the age of 24, I learned the devastating consequences.
The Republican weaponization of Clinton's misdeed was to claim that this behaviour made Bill unfit to govern. (If powerful men having extramarital affairs with young women was incompatible with leadership, well, the vast sweep of history does not so record.)
Family values aside, the power imbalance creates the risk that Bill would abuse his immense power to cover up the vastly exaggerated blot on his record. The Republicans actually knew that anyone with an accurate base rate of human history / human culture would not regard his behaviour as incompatible with leadership—though a common and damning blot nevertheless, so the tactic was to escalate the stakes until Bill felt compelled to lie about it—which, unfortunately, was extremely easy to anticipate.
Lying to formal body of review is considered incompatible with leadership, sort of, incrementally, since not all that long ago. For example, it barely extends as far back as the Reagan's Iran–Contra affair. (Some people roll with family values and view Clinton's offense as the worse offense. I happen to roll with geopolitical transparency, and so I view Reagan's offense as the worse offense—he appointed those clucks, and it was his ultimate responsibility to know all the big shit).
Bill was plenty smart enough to figure out that the public perception battle would play out exactly as it did, leaving him boxed into a corner where he could—according to his established character—only choose to lie (perhaps he overestimated his power to blow off the investigation, but even there, had he succeeded, he would have mortgaged a sizeable fraction of his presidential energy in ruthlessly defending his momentary gratification).
Clearly, his judgment in this matter fell short of the mark by any standard.
However, I rate it not quite as bald as boasting about sexual harassment with a camera rolling. Whatever Bill purportedly said to Donald on the golf course (that was "far worse" in Donald's personal judgement), there was no film at eleven after the fact.
The modern world contains a lot of cameras and microphones. Trump's world has contained many cameras and microphones since way back. A prudent man in his position wouldn't be openly bragging about his magical power to get away with sexual harassment just to impress Billy Bush. And it's not like Donald didn't have a front row vantage point on Bill sinking his own boat through which to consider and amend his own standard of personal conduct. Donald had every opportunity to know better, and the penny never dropped.
So in summary, a whole lot of things are "not okay" but still the world largely spins as it has always done for thousands of years.