It's rude to smell bad.
Penny is at the gym working out she is going on a blind date later tonight.
Penny wants to be on time for her date.
Penny leaves the gym early, so she can go shower and get ready for her date, and she makes it to her date on time.
After the gym Penny goes home to get ready for her date she decides to skip the shower, and she makes it to her date on time.
Penny smells good and her date calls her back the next day.
Penny smells bad on her date and her date never calls her back.