Maybe he just masturbates a lot, and starts sweating furiously then opens a window to cool off. I mean it makes sense if it always gets opened while you're gone....
In all seriousness, I like FRIGID temperatures. I don't know why, but anything over about 60-63* and I start sweating while just sitting around. Far more comfortable in the cold weather, which isn't a problem now. I just keep my window open in my room, and keep the door shut. When I lived in the dorm, my roommates always liked the cold too, but not as cold as I liked it, so we just turned our air conditioner to 60 degrees and always left it there. Perfect middle ground.