it depends on the smell. If it is a musky smell, it is normal. Men's testicles smell musky as a means to attract sexual partners. Musk is a sexual attractant.
I suspect that what you and the other person who mentioned this are experiencing is sweat mixing in with the musk. That makes it *real* potent. Because your scrotum is located between your legs and you have constant skin2skin contact, you will sweat down there a lot.
The other suggestions given are all good. Basically though, if you don't want white power in your pants, is just to make sure you shower regularly and after physical exercise. Frankly, any body spray will just mask your normal smell with its own.
It amazes me that many men spend time trying to wipe away their natural (as in nature-designed) smell only to replace it with body soaps, cologne, and after shave that also smell like musk!