This strikes me as perfectly fitting the natural instincts.
Initially, you have to prove yourself. You then succeed enough to find a mate and start a family. This reduces your tolerance for risk, as it should: your kids need you.
Once you no longer have small children, you will likely hit a midlife crisis. At this point you may be tempted to have an affair or buy a Ferrari. This is an instinctive reaction to the lack of small children -- you aren't reproducing successfully with your current mate.
Initially, you have to prove yourself. You then succeed enough to find a mate and start a family. This reduces your tolerance for risk, as it should: your kids need you.
Once you no longer have small children, you will likely hit a midlife crisis. At this point you may be tempted to have an affair or buy a Ferrari. This is an instinctive reaction to the lack of small children -- you aren't reproducing successfully with your current mate.