There is no such condition wherein a man's “semen comes slowly”. Two months is too short a period to diagnose possible sterility, or to exclude this diagnosis. You and your wife will need to try for a pregnancy for at least one year before a sterility problem could even be considered. If, however, you have a strong intuition that your sperm is causing possible fertility problems, then you can request a sperm analyses: spermogram (sperm amount, spermatozoid count, mobility, vitality, morphology) as well as functional tests. In order to get started on this, you can consult your GP and a urologist, if necessary.