If you have a fairly long commute where you sweat, do you wear the same shorts on your return trip as you wore on the way in?

Right now I only bike my commute one direction per day, so I just wear new shorts each time. I'm thinking about biking both ways on some days. I can see leaving a sweaty shirt to dry out for the afternoon commute...but what about the shorts? Would it be gross to wear them twice in one day or is that what most people do?

FYI: I commute 14 hilly miles each way, so I pretty much always sweat.