When (if) you hook up with a female of the species, she will (eventually) explain it to you (all you non-Dads, not just PJ). Many of them (women) start out saying the same thing, for the same reasons - and they're good reasons; logical, rational ones. By the time you and she pass about age 25, if some accident doesn't happen first, the urge will strike: first her, then you. When you hold L'il Junior on his date of birth, you'll know "Why Would Anyone Have Kids?", and your whole world will change.

Free Tip: Fatherhood is OK; though lot's o'work with very little recognition. Grand-fatherhood, however, is something to look forward to. Trust me.