Statistics show that in at least 40% of infertile couples, there is a male factor contributing to the problem. Male fertility screening is done through semen analysis. The general rule is that the lower the sperm count and the poorer the sperm quality, the longer it will take and the more difficult it may be for a pregnancy to occur. However, even men with very low sperm counts may eventually be successful in causing a pregnancy. The sperm count only needs to be high enough for that one time that ovulation occurs, in order for a pregnancy to be possible.