I would guess that the culprit is the difference between speed of technological advance and biological evolution.
As we have become richer in resources and free time, we both have the option to and the tools required for overstimulating any of our “drives” (sex, apetite for eating food, socializing online), without having had the time for individual level evolution to catch up. We see adaptations at the group/cultural level because changes there happen more quickly, and are easier to notice. If the pressure remains sustained for a long enough time, we’ll see biological changes, too.
I would guess that the culprit is the difference between speed of technological advance and biological evolution.
As we have become richer in resources and free time, we both have the option to and the tools required for overstimulating any of our “drives” (sex, apetite for eating food, socializing online), without having had the time for individual level evolution to catch up. We see adaptations at the group/cultural level because changes there happen more quickly, and are easier to notice. If the pressure remains sustained for a long enough time, we’ll see biological changes, too.