Not having babies is absolutely the best choice, the right choice, the logical choice. 100% behind you not having babies in a survival situation, bro.
That Said;
A multiple person relationship is also a very good choice, a right choice, and a completely logical choice. I am 100% behind the idea, but... unlike a high school boy, the other side of that choice is that the girls can have as many, or as few, boys as they want as well.
Um not saying to be a ho (which is totally fine, but not super productive... and also super REproductive...), but... being non-monogamous is a super good survival strategy; it absolutely is.
Just remember that non-monogamy cuts both ways, my dude.
Either eliminate the word "cuck" from your vocabulary, or choose a different path.