I see this when my kids (who do not go to movies and do not have a television) get together with their cousins that do. The difference is shocking. And when I point this out to my mother, she simply does not see it. But once I point it out, she says, “yeah, you’re right”. Bottom line: repeated exposure to vulgar things dull your senses.
Mussar Seforim do a good job of cleansing your mind from accidentacl exposure you refer to. If that is not your cup of tea, there is a terrific tape series by Rabbi Buchwald of National Jewish Outreach that put human relationships in a context for today’s society. It will change the way you look at the human relationship in a way you would not believe