Eggs not hatching...why?

I have one bedraggled hen and one amorous rooster (both Standard Cochins) and after the third batch of rotten eggs, still no chicks. The hen has set on three clutches of eggs and each time winds up kicking them into the middle of the chicken house. This last batch was stinky!

My question is this: do I have a sterile rooster or is the hatch rate of eggs just bad? Each time her clutch has been small, never more than three. If she's not setting she lays about five eggs a week.

What do I do? Just let her waste away her summers sitting on infertile eggs? I bet she would set even if he wasn't there, constantly "harrassing" her.

Kimberly