How to tell a guy to change his sheets?

Anonymous
So I've been seeing this guy for like 6 months now. We're not a couple, just friends with benefits.
I never noticed until recently that he rarely changes his sheets. I can see dirt on them and feel so icky when sleeping that I can't get a confortable rest.
How do I tell him to wash them without being rude.
And like I said, we aren't a couple so I know he probably is having sex with others in that bed. So I really need to say something or I can't go over again. I just don't know how. Help!
How to tell a guy to change his sheets?
14 Opinion