Red Nosed Reindeer

Olfactory dysfunction affects sex life    clearly "mature" content.

Apparently, people with impaired sense of smell have less sex partners that better smellers.
Now I can think of a lot of ways a lack of detectors might affect behavior, like via HLA immune molecules, which seem to be olfactory triggers.   And any other number of ways.
But I would just like to make sure you know that olfactory dysfunction preceeds a number of types of devastating neurological diseases.   Like Alzheimers, and Parkinsons.   And narcoleptics seem to have it too.   And alcoholics.  And you got Apnea?   Yeah, you.

Olfactory dysfunction is a symptom of chronic low level infection.
Herpes, strep pyogenes, strep pneumonia, and staph aureus all can colonize the sinuses.
Take care of it.  Wash your nose with saline.   Switch to e cigarettes.   Take vitamin D.

You don't want those nerves to die.   They are a direct interface to your brain.   You kind of need them.