Real Men Want to Have Children

Deutsche Fotothek‎ [CC-BY-SA-3.0-de (www.creativecommons.org/licenses/by-sa/3.0/de/deed.en)], via Wikimedia Commons

#1 Because he must love his wife as God loves. Therefore, he must know and believe that true love bears fruit, and that he cannot deny the natural end of consummated love without denying love itself. And so, as creation is God's act of love, so must pro-creation be a man's act of godly love.

#2 Because he must image God. The Sacrament of Matrimony reflects Christ's love for His bride, the Church (Ephesians 5:21-33). The man images God, the woman images what will be the pure and perfect Church for whom our Lord gives His own life. So not only must man do the ultimate sacrifice of self for his wife when necessary, he must also reflect the life-giving nature of the Divine, who pours Himself out completely to His beloved Church, who creates souls into existence out of pure, sheer love. The man must take pride in this gift - in the fact that he is bestowed this great dignity to participate in the Lord's creation of souls, in loving persons into existence.

It's a Theology of the Body thing.