Today, I had to explain to my neighbours that I wasn't "watching porn" earlier, and that I was honestly just watching an episode of Game of Thrones. FML
The only reason they could hear it was because my apartment has pretty thin walls and I was doing dishes, watching it on my laptop beside me. The volume was cranked so I could hear it and of course that suuuuper long scene with Little Finger and the two girls came on -_- They were good about the whole thing and laughed it off and I promised to turn it down.
In other words, no it isn't their business what you watch, unless you make it their business by playing it much louder than necessary.