Because they cause your brain to release dopamine and other chemicals that make you feel all warm and tingly.
Also it's wild how dopamine can't cross the blood-brain barrier, so the only way we can get more of it is using other chemicals that cause the brain to release more dopamine (or jacking off). Like what would it feel like to just stick a syringe in your brain and inject a ton of raw dopamine?
>>11078416>its a tautology the will always be correctNot at all, there are plenty of traits that bestow no evolutionary advantage whatsoever.
