I change mine once a week. I kind of thought that's what everyone did, because clean sheets feel so luxurious and dirty ones so grody. (to me, at least). But several acquaintances (who shall remain nameless) told me they change their sheets twice a month, if that. And judging from all of our various states of romantic involvedness or not, the sheet-changing frequency has little to do with what goes on in the bedroom.
How often do you change yours?
