Sterility, fecundity, what about the men ?

Human reproduction is based on the sexual union of a man and a woman. Nonetheless, scientific research on fertlity (births), fécundity (the ability to give birth) or contraception (birth control) is mainly devoted to women and practically ignores men. Some studies on male fecundity have been carried out, however. These focus on the role of men in three aspects of human fecundity: couple infertility, the question of a possible male fecundity decrease with age and the hypothesis that the fecundity of younger male generations may be diminishing