Years ago I was asked to sponsor a German high school student for a year. He was a slob so it was up to me to change the bed linen etc. I'd go into his room and collect the sheets etc. There was one occasion when I went in stripped the bed and picked up his socks, underwear and t shirts all over the room. One sock however was freshly soaked in cum. After that, I changed the sheets only.
On the other hand, a roommate back in college was always leaving a t shirt or sock on the floor and I loved shoving my face in it and wanking into it and putting it back.