I have roommates, but they’re young guys who are not so discreet; one of my roommates often only closes the door part-way when he’s in there. I tend to be a bit more private about such things, but like @JLeslie, with my brother growing up we often did not close the door to the “facilities” that we shared.
I do enjoy getting to blast music with my sound system or watch TV in my underwear. And although I am the cleanest of the three of us, I often will put off cleaning until later, allowing things to pile up around the house for a while, something that I wouldn’t do if I were living with a partner or living at home.