sudden weight loss and fertility

This is probably a stupid question, but does anyone know if male's weight has anything to do with the quality of sperm? My hubby has recently lost about 20 pounds by exercising and I am concerned that this sudden weight change will affect the ability of the sperm to fertilize the egg:)))
I know that sudden weight change in women might cause some issues with fertility, but wasn't sure about men.

Thanks

[amberd5191]

loosing weight can help a man gain sperm count

[AnnieBrooke]

It might increase his sexual desirability, hence his chance to prove his fertility.  ;)

[pixijal]

I agree w/the above.  He not only has lost the weight, but has done it in a healthy manner.