To raise the likelihood that your genes will survive.
That's not my "job" and isn't really an imperative either -- lots of people remain childless by choice. I think it is an empirically observable fact that males do NOT attempt to impregnate as many females as possible and the women do NOT stick to the richest male they can attach themselves to. It's just not happening.
Maybe you think this is the way it should be or was meant to be, but your opinion is normative, not descriptive.
I give up.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.