My husbands count went to none, but maybe one or two, to getting pregnant
with Lauren 15 months after Kathryn was born. Sperm
test inbetween had him listed as low, but normal. Kathryn's genesis was aided by donor sperm. He started taking vits about 6 months or so before we got pregnant with Kathryn.
Donor sperm is also an alternative to look into. Very hard decision for the men, but they need to realize however a child gets here, it is their child.