internally, sexual harassment will happen regardless of sex. i've encountered it with every job i've had. everyone is subject to it, it's just more notorious with places like the policing divisions simply because women are out numbered and there's competition between them, which leads to the leeway of it.
publicly, i'd be willing to wager that men face more sexual harassment. not because of the numbers, but it's more socially acceptable.
i agree that it's does not automatically happen, but it should and that's my point. a person of authority shouldn't be judged on their sex. if a police officer pulls you over, would you be more polite and willing to comply if it were a male opposed to a female? i doubt you would simply because you're respecting the uniform not the person behind it.