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That's probably a sign of a fungal infection. Assuming you already shower, wash your junk with soap, and you put on clean dry underwear every day, the summer heat may be getting to you. I would suggest you double tap your dick and balls with terbafine cream after toweling off, then when that absorbs (usually about a half hour), finish up with clomitrazole powder before you get dressed and go to bed (or go on with your day). This is when you're *not* riding. Do this every day for 2 weeks and the smell should go back to normal.
To reiterate, if you can smell your genitals through your pants, no that is not normal. Instead of being embarrassed or defensive, fix the problem.