i am just randomly posting this as food for thought.
i am a yeshiva bochur learning in yerushalaim.
and i can tell you that walking through the charedie neigborhoods on the way back from yeshiva. i dont see non frum people. rather i see the frum married women. and when trying to take your mind off of taavos, it is very hard when you see the uncovered leg [below, even if the knee is covered], that is meorer tavvos. and it gets into your head. even seeing one women like this, when you are sensitive to it, is meorer. and causes taavos, and who knows what else.