Well, you're not exactly primally driven to reproduce. You're primally driven to engage in some behavior, and experience hedonistic pleasure from it, with the side effect of reproduction. Reproduction is expensive, so evolution created a dirty trick. This is why birth control is so damn popular. You're driven to fuck, not to reproduce. I have no idea what the experience is for an amoeba, but I would guess it feels more like ejaculation than tears of joy to them.

For a lot of people though, the desire for children is there, strong, and comes from somewhere else, almost like it comes from somewhere deeper like a soul or something. I know that's true for me. My goal with my relationship, and well before that when I was shopping, was about family for most of my adult life. It seems this is out of fashion these days and people figure it out late. Hedonistic pleasure is fleeting, creating amazing people can go on literally forever if done correctly, it is an ambition and achievement unto itself, and is rewarding in a way science doesn't yet understand, to be a little facetious.