Re: Sperm test!
IF all the tests have been done for both of them and IF they havent conceived in a reasonable amount of time then the fertility specialists start looking for interactions between the guy's sperm and the gal's egg. Its not very common but sometimes the sperms are not able to enter and fertilize the egg due to some kind of allergy or due to lack of a certain (protein I think) that the sperm uses to get into the egg. In those cases, the couple would need to go for IVF.