Modern “rabbis” like to say as a ln article of faith that “the obligation of shmiras aynayim is squarely on the shoulders of men” – they repeat it as if it were a pasuk. They say it the same way they repeat ad nauseum a line of “living a modern life within the framework of halacha.”
These are both meaningless sound bytes which have zero logic or mesorah. A 5th grader knows what lifnei iver is. The same 5th grader can read pele yoetz which writes that women take the first punishment if a man is nichshal by looking at them, if they are not dressed according to halacha.
It’s a powerful urge to justify pritzus that leads modern clergymen to spew that line; they will do anything and everything to not admit that their community has a serious problem.
But of course they have no problem chastising the frum for how we supposedly treat goyim and don’t serve in the Israeli army.