What Should I Do About My Brothers?

Whenever I'm online, my brothers (they're in high school and older than me) will ask what videos I'm watching or will try to reach over and see what I'm looking at. Although I'm not watching anything inappropriate, I still don't feel comfortable telling them what I'm watching (I watch metal videos and anime stuff. Sometimes yaoi but rarely ever ^^). They don't know anything about what I watch and if they did know I'd never hear the end of it. Also, I don't tell them because the computer is like

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