Havesomeseichel, who told you that Rabbonim are not adamant about the shemiras eynaim for the men? And there is not much what to give shiurim about here — they know their obligations. Plus, if someone, chas ve’sholom, does something wrong, it is hard to detect for other people.
For women ,there are more details to know. Plus, when someone starts steping out of line, everybody can tell right away. Hence, the shiurim.
And, yes, derech klal, for a married woman: the less attractive she looks in public, the better it is. We can not obligate every woman to uglyfy herself in public, but it is a middas hasidus for her to do so. And trust me, sh’miras eynaim and machshovos is a lot of pressure for the men ( considering the way Goyos are undressed and Bnos Yisroel are pitsed up).