If your bike gloves smell sweaty when warm and make your hands stink you can do something about it.

If they are leather with a man-made lining turn them inside and hand wash them with some detergent for delicate clothing, rinsing them well.

Then let them dry naturally (not on a radiator or in the microwave ­ yes it¹s been done). A decent leather dressing will restore suppleness.

Further reading:
Motorcycle FAQ