It is extremely difficult to be madgir the issur of hirhur for women; I suggest we leave it alone. It is difficult to concieve that hirhur would be forbidden based ervah; basing on Niddah would be even more difficult, I’d be curious to see a source.
Lo Sikrevu on Hirhur? Is that even true for a man? Source! (Hishamer Lecha Mekol Davar Rah would apply for a man because of the resulting issurim, but not for a woman. The Ramban in Yevamos speaks of Hirhur for women being problematic, but not based on a posuk).
BUT-
But the influence is real. We become more promiscious, more violent – we are influenced by what we see and hear. This is real. There is a double digit billions industry called advertising – which means that behaviorism works. What we see, what we hear – we do. I do – you do. This is how marketing & advertising work – and are they successful!
This is why the Torah tries to influence us on a constant basis. Say the Shema – twice a day. Everyday. Repition. Behavioralism.
America has destroyed it’s soul through the media. Destroyed it’s values & morals. True, some music is wonderful, some movies perhaps once upon time were as well – but today, since 99% percent is garbage and will influence us to evil – not because we are weak, but because we are human.
You honesty & desire to grow is certainly a great maalah, more then anything you listen to or see. But, to keep that wonderful maalah, you should water it – not poison it.
But L’Maaseh, we are not going to sit and read sifsey chaim all day. Find a hobby. Get involved. Do something you enjoy, spend time with real people with real feeling. Learn a musical instrument and fill those needs for real music.
Enjoy what is real, what is here, what is now.
And worst of all – TV & Movies teach us that life is constantly – well, on the edge of life. We lose our taste for real, beautiful, refreshing day to day life. We become zombies on the last minute saved by the dashing hero before the nuclear goes off and destroys the universe.
And we fall fate to the ultimate killer – the belief that life is later & elsewhere. Life is after I graduate, get married, lose ten pounds, marry off my grandkids – then life begins.
And that is a sad life, never ever lived. And is worse then any issur; it is lose of the point of it all. It is a living death. A life where only the fake is called real. Made in The USA, of course.