It's too bad to read these reports about his lecherousness, because he was without question a giant in the US world of letters.
Well, hitting on women (for men), hitting on men (for women), drinking, taking drugs, being tightwad, being lavish, being easily angered, and tons of other things, never stopped anybody from being a giant of letters or the arts, a great politician, a good scientist, a great athlete, a great actor, a great humanitarian, a great businessperson or any other thing... In fact it's probably more common in the great men and…
If female grad students were inviting him over for booty calls I think the tone of the conversation would be much different.
But the claim is that he was making advances on people who didn't welcome them. This is especially a problem since he was an influential professor with power over their careers.
Even for professors, where the natural state for many is social awkwardness, you have some obligation to read the signs of when your behavior is unwanted.