Yes. There are a lot of guys that do it, not all of them are gay. Most who trade soiled jockstraps with each other are gay. Some guys who tend to get off on a man's odor as well as how the strap looks on a man have the jockstrap fetish. But many straight males, like myself, enjoy the feel & look of jockstraps on ourselves as well. Between the accentuation of the pouch over your genitals combined with the snug fit, while your buttocks are exposed & framed by straps. Jockstraps provide a unique feel unlike no other garment, They are male undergarments, usually never seen in public, thereby adding to the mystique. How they accentuate that region of a man's body & how they feel on you as you wear them makes them sexy as hell.
I personally don't like to soil jockstraps, but they do make a design with a hole above the pouch & below the waistband where your penis can stick out & you can masturbate while feeling yourself in the strap with the other hand. it's a genius in design if you ask a jockstrap fetishist.