Your question itself is a perfect example: "How do you properly use a noun two times in a sentence?" contains the nouns 'noun' and 'sentence'. Another, more generic, example might be: "The dog...
It may feel uncomfortable for the male.
The crime was committed at 10:06pm, and the suspect was in the vicinity at said time.
You can if you want, but I recommend that you don't because it sounds awful and bad and don't use it because people will complain and stuff.
At this time you may leave the classroom.