I agree that it would work perfect if you don't have multiple females for each male but one is actually more than it sounds. If you have 4 females for the one male that's 2 pair ups per month instead of just one or if there are 2 females that 4 instead of 2. So it really does make more sense to me. 1 pair up per month didn't seem like enough to me and thats why it makes more sense.

Thanks for everyones responses